Engine fuel supply system

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ENGINE FUEL SUPPLY SYSTEM SUMMARY OF THE INVENTION

FIELD OF THE INVENTION In accordance with the present invention, there is pro The present invention is a fuel Supply System for an Vided an improved fuel Supply System for Supplying fuel internal combustion engine. More particularly, the invention from a fuel Source, Such as a fuel tank, to a combustion is a fuel Supply System arranged to deliver vapor-free high chamber of an engine.

preSSure fuel to a fuel injector for injection into a combus Preferably, the fuel Supply System includes a vapor Sepa tion chamber of the engine. rator for Separating vapor from fuel which is delivered from the fuel Source. A first pre-pressurizing pump pressurizes

BACKGROUND OF THE INVENTION fuel from the vapor separator to a first pressure and delivers Internal combustion engines operating on a two-cycle it to a Second high preSSure pump. The Second pump principal have traditionally been arranged So that fuel is preSSurizes the fuel to a pressure above the first pressure and delivered into an incoming air Supply. The fuel and air deliverspreSSure it to a fuel injector which injects the fuel at high into the combustion chamber.

mixture passes into a crankcase chamber for crankcase The fuel Supply System preferably includes a fuel cooler compression, and is then delivered through a Scavenge 15 positioned between passage to a combustion chamber of the engine for com for cooling the fuel.theInvapor Separator and the fuel injector addition, a valve controls a return bustion therein.

flow of a portion of

AS is well known, in the operating cycle of a two-cycle back to the vapor separator. the fuel Supplied by the Second pump engine, an exhaust port leading from the combustion cham In accordance with the present invention, a fuel Supply ber is open during at least part of the time the Scavenge System is provided which delivers fuel at high pressure to a passage is open. Thus, exhaust along with a portion of the air fuel injector for delivery to a combustion chamber of an and fuel charge being delivered through the Scavenge port engine. The fuel Supply System is arranged to reduce the flow through the exhaust port into the exhaust System. creation and transmission of vapor within the fuel to the In this arrangement, and especially at low engine Speeds, a large amount of fuel must be added to the air to compen 25 combustion chamber. Further objects, features, and advan sate for the loss of fuel flowing through the cylinder and tages of the present invention over the prior art will become apparent from the detailed description of the drawings which directly out the exhaust port. Supplying excessive fuel, follows, when considered with the attached figures. however, is costly and can result in Stalling of the engine. In addition, the quantities of fuel flowing into the exhaust may BRIEF DESCRIPTION OF THE DRAWINGS foul a catalyst positioned in the exhaust System. FIG. 1 is a side view of an outboard motor propelling a AS one attempt to Solve the above-Stated problems, Some watercraft, illustrated partially and in cross-section, the two-cycle engines have been arranged to have fuel directly motor powered by an engine having a fuel Supply System in injected into the combustion chamber. A fresh air charge is accordance with the present invention and illustrated in Supplied to each combustion chamber through the crankcase phantom;

and a Scavenge port. Once air is Supplied to the combustion 35 FIG. 2 is a cross-sectional view of the engine powering chamber and the exhaust port is closed, a fuel injector injects the motor illustrated in FIG. 1;

fuel directly into the combustion chamber for mixing with FIG. 3 is an enlarged cross-sectional view of a cylinder of the air. the engine illustrated in FIG. 2;

This arrangement has the benefit that little of the fuel FIG. 4 is a Schematic illustrating the arrangement of the flows unburned into the exhaust System, and the amount of 40 engine illustrated in FIG. 2;

fuel Supplied to each combustion chamber may be closely FIG. 5 is a top view of the motor illustrated in FIG. 1, controlled. On the other hand, in order for this system to illustrating the engine having a fuel Supply System therein; work, fuel must be Supplied to the fuel injector under high FIG. 6 is a cross-sectional view of a check valve of the preSSure. In particular, a large amount of fuel must be fuel Supply system of the engine illustrated in FIG. 1; Sprayed into the combustion chamber in a short time, and in 45 FIG. 7 is a Schematic illustrating a fuel System in accor a manner which atomizes the fuel. Thus, these Systems have dance with a first embodiment of the present invention; a fuel Supply which includes a fuel tank and a high pressure pump for pumping fuel from the tank and Supplying it under FIG. 8 is a Schematic illustrating a fuel Supply System in high pressure to the fuel injector. accordance with a Second embodiment of the present inven A problem with this arrangementarises in pressurizing the 50 tion;

fuel from tank pressure (typically atmospheric pressure) to FIG. 9 is a Schematic illustrating a fuel Supply System in this high pressure by the high pressure pump. First, if a accordance with a third embodiment of the present inven Single pump is used, for the pump to create the large pressure tion;

head in the Single Step, its capacity must be very low and FIG. 10 is a schematic illustrating a fuel Supply system in insufficient fuel may be Supplied to the engine. Another 55 accordance with a fourth embodiment of the present inven problem is the introduction of large amounts of vapor into tion;

the fuel. This vapor may cause a vapor lock in the System FIG. 11 is a side view of an outboard motor powered by and alters the amount of fuel which is actually delivered to an engine having a fuel Supply System in accordance with the combustion chamber during a desired fuel delivery time. the present invention and including a first embodiment fuel Thirdly, Such a high pressure pump must operate at high 60 cooling arrangement;

Speeds, and thus achieves high temperatures. When the fuel FIG. 12 is a side view of an outboard motor powered by is hot, vapor creation within the fuel is accelerated, wors an engine having a fuel Supply System in accordance with ening the above-Stated problems. the present invention and including a Second embodiment A fuel Supply System for delivering fuel from a fuel Source fuel cooling arrangement; and to a combustion chamber of an engine through a fuel injector 65 FIG. 13 is a croSS-Sectional view of a vapor separator and at high pressure and without the above-Stated problems is fuel cooler of the fuel Supply System with fuel cooling desired. illustrated in FIG. 12.

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DETAILED DESCRIPTION OF THE The transmission drives a propeller shaft (not shown) PREFERRED EMBODIMENTS OF THE which is journalled within the lower section 40 of the lower INVENTION unit 34 in a known manner. A hub of the propeller 70 is In general, the present invention comprises a fuel Supply coupled to the drive shaft, rotation of the propeller moving System for an internal combustion engine. The fuel Supply water which effectuates movement of the watercraft 24. System is arranged to deliver fuel at high preSSure for As illustrated in FIGS. 4 and 5, the engine 22 includes an injection into each combustion chamber of the engine, and intake system for providing air to each cylinder 54. The yet is arranged to prevent the creation and delivery of vapor intake manifold preferably includes an air intake 72. Air is within the fuel to the combustion chamber. drawn from outside the cowling 30 of the motor through a Referring to FIG. 1, there is illustrated an outboard motor vent (not shown) and into the air intake 72. Air passing 20 powered by an engine 22 and having a fuel Supply System through the air intake 72 is divided and passes through a in accordance with the present invention. The engine 22 passage 74 corresponding to each cylinder 54. having the fuel Supply System is described for use with an Means are provided for controlling the flow rate of air to outboard motor 20 Since this particular application is with 15 each cylinder 54. In the present embodiment, this means which the engine 22 described is particularly useful. It comprises a throttle valve 76 movably positioned in each should be understood, however, that the engine 22 which is passage 74. Each valve 76 preferably comprises a butterfly Supplied with fuel with the fuel Supply System arranged as type valve which is controlled remotely by the operator of described may be used in other applications. the watercraft 24.

As illustrated in FIG. 1, the outboard motor 20 is of the Each intake passage 74 leads to a chamber within the type utilized to propel a watercraft 24. The outboard motor crankcase 66 corresponding to one of the cylinders 54. A 20 has a powerhead area 26 comprised of a lower tray reed-valve 78 is preferably provided in each intake passage portion 28 and a main cowling portion 30. The motor 20 74 for permitting only one-way passage of the air into each includes a lower unit 34 extending downwardly from the crankcase chamber.

cowling portion 30. The lower unit 34 comprises an upper or 25 AS Stated above, the engine 22 operates on the well known “drive shaft housing” section 38 and a lower section 40. two-cycle principle. AS Such, during a crankcase compres The powerhead area 26 of the motor 20 is connected to a Sion cycle, air within the crankcase chamber is compressed Steering shaft (not shown). The Steering shaft is Supported and flows through one or more Scavenge passageS 80 leading for Steering movement about a vertically extending axis from the chamber into the cylinder 54.

within a swivel or steering bracket 44. The Swivel bracket 44 AS described in more detail below, a fuel Supply System is connected by means of a pivot pin 46 to a clamping provides fuel to each cylinder 54 for combustion therein bracket 48 which is attached to a transom portion 32 of a hull with the air Supplied as Stated above. 36 of the watercraft 24. The pivot pin 46 permits the Referring to FIG. 2, exhaust generated during the com outboard motor 20 to be trimmed and tilted up about the bustion horizontally disposed axis formed by the pivot pin 46. An oil 35 exhaust process port 82.

is routed from each cylinder 54 through an

Each exhaust port 82 comprises a passage filled cylinder 45 may be used to assist in this movement.

Referring to FIGS. 1 and 5, the engine 22 is positioned exhaust ports 82 for engine leading through the the block 50 from cylinder 54. The cylinders 54 of each bank join into within the cowling 30 of the motor 20. As best illustrated in a common exhaust passage 84. The common exhaust pas FIGS. 2 and 5, the engine 22 is preferably of the six-cylinder sages 84 lead downwardly to the bottom end of the engine variety, operating on a two-cycle principle, and arranged in 40 22.

“V” fashion. In this arrangement, the engine 22 has a cylinder block 50 with a pair of cylinder heads 52 connected Means are provided for routing the exhaust from the thereto. Each cylinder head 52 cooperates with the block 50 bottom of the engine 22 to a point external to the motor 20. to define three cylinders 54. A combustion chamber 56 is Preferably, the engine 22 is positioned above an exhaust defined within each cylinder 54, preferably partly by a 45 guide 85 within the motor 20. A pair of passages 86 extend recessed area within the cylinder head 52. through the exhaust guide 85 corresponding to the common Referring to FIGS. 3 and 4, a piston 58 is movably exhaust passageS 84 leading through the engine 22. mounted within each cylinder 54. The piston 58 preferably A muffler 90 is positioned in the upper section 38 of the has a recessed top Surface area 60 of a shape known to those lower unit 34. An exhaust pipe 88 extends down from each skilled in the art for inducing fuel and air mixing within the 50 passage 86 through the exhaust guide 85 into the muffler 90 cylinder 54. The piston 58 is connected by a connecting rod for directing the exhaust into the muffler 90. Exhaust from 62 to a crankshaft 64. The crankshaft 64 is rotatably each exhaust pipe 88 is kept separate by a divider 92, with mounted in a crankcase 66 defined by the engine block 50 the exhaust from each exhaust pipe 88 directed into one of and a crankcase cover 68 connected thereto. two exhaust expansion areas 94 defined within the muffler As illustrated in FIG. 2, the engine 22 is preferably 55 90. The exhaust is routed from the muffler 90 through an mounted within the cowling 30 so that its cylinders 54 are exhaust passage 96 extending through the lower Section 40 generally horizontally extending. So arranged, the crank of the lower unit 40 to a through the hub exhaust discharge, shaft 64 is generally vertically extending. The crankshaft 64 as is well known in the art.

is arranged to drive a means for propelling the watercraft. As illustrated in FIG. 3, a cover 100 extends over each Preferably, this means comprises a propeller 70. 60 cylinder head 52. Bolts 102 or other fasteners are used to In this arrangement, the crankshaft 64 is connected to a connect the cover 100, head 52 and block 50. top end of a drive shaft (not shown) which extends down Referring to FIG. 3, means are provided for igniting the wardly through the lower unit 34, where it drives a bevel air and fuel Supplied to each cylinder 54. Preferably, this gear and a conventional forward-neutral-reverse transmis means comprises a spark plug 104 having its electrode 105 sion. A control (not shown) is preferably provided for 65 positioned within the combustion chamber 56 of the cylinder allowing an operator to remotely control the transmission 54. An ignition circuit, as is known to those skilled in the art, from the watercraft 24. is provided for inducing a spark at the electrode tip 105 of

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S 6 the Spark plug 104 at a determined time for igniting an air the greater the Spring force and thus the higher the fuel and fuel mixture within the cylinder 54. preSSure which must be achieved to permit flow through the In accordance with the present invention, a fuel Supply outlet 132.

system 106 provided fuel to each cylinder 54 for combustion As illustrated in FIGS. 5 and 7, the high pressure fuel therein. A fuel Supply system 106 in accordance with a first pump 122 is preferably driven by the crankshaft 64 of the embodiment of the invention will be described with refer engine 22. In particular, a drive pulley 148 is mounted on the ence initially to FIGS. 1 and 7. crankshaft 64 and a similar pulley 150 is positioned on a The fuel Supply system 106 draws fuel from a fuel supply drive shaft of the pump 122. Abelt 152 extends between the or Source, Such as a fuel tank 108 or reservoir. As illustrated, pulleys 148,150, whereby the drive pulley 148 drives the the tank 108 is positioned within the hull 36 of the watercraft pump 122.

24. A first low preSSure or primer type pump 110 is posi The pump 122 pressurizes the fuel to a Second pressure tioned along a fuel delivery line 112 leading from the tank above the first pressure and delivers it through a line 154. In 108. The delivery line 112 leads to a fuel filter 114, and accordance with the present invention, a portion of the fuel thereon to a Second low pressure pump 115 and then a vapor 15 Supplied by the pump 122 is returned back to the vapor separator 116. Preferably, the second pump 114 is of the separator 116. Preferably, the fuel is diverted by a pressure electrically operated variety. activated valve 156 back to the vapor separator 116. This valve 156 is similar to that illustrated in FIG. 6 and described

The vapor separator 116 is utilized to remove air from the fuel, as is known in the art. The fuel is then pumped by a first above.

or pre-pressurizing pump 118 through a line 120 to a high The remainder of the fuel is delivered through a main pressure pump 122. The pump 118 is preferably of the delivery line 158 through a fuel filter 160 to a high pressure electrically-operated type and positioned within the vapor fuel rail 162. A fuel injector 164 is provided corresponding separator 116. The first pump 118 pressurizes the fuel to a to each cylinder 54, as illustrated in FIG. 3, and is arranged first pressure above the pressure of the fuel within the vapor to spray fuel F into the cylinder 54. The fuel injector 164 is separator 116. arranged to draw fuel from the fuel rail 162.

Means are provided for cooling at least a portion of the In accordance with the fuel Supply system 106 of the fuel Supplied to the high pressure pump 122, whereby vapor present invention the pump 118 pre-pressurizes the fuel, So creation within the fuel during the pressurizing by the high that the high pressure pump 122 need not further preSSurize pressure pump 122 may be minimized. Preferably, this the fuel in as great of a pressure rise to reach the desired fuel means comprises a fuel cooler 124. Supply pressure. Because the degree to which the high In accordance with this embodiment, a portion of the fuel preSSure pump 122 must preSSurize the fuel is reduced, the amount of vapor produced during the pressurizing Step is delivered by the pump 118 through the line 120 is diverted minimized.

through the fuel cooler 124 and returned to the vapor separator 116. As illustrated, the amount of fuel diverted is theInfuel addition, the fuel cooler 124 lowers the temperature of flowing through the fuel System. LeSS Vaporization determined by a Setting of a preSSure-regulator type check 35 valve 126. The fuel cooler 124 thus cools fuel which is or air-entry into the low temperature fuel occurs. mixed with the fuel in the vapor separator 116, thus lowering In this embodiment, the valve 156 diverts a portion of the the temperature of the fuel therein which is delivered to the fuel back to the vapor separator 116. The valve 156 is useful high pressure pump 122. in diverting what little vapor may be present in the System The valve 126 controlling the amount of fuel diverted 40 back to the Separator 116 for Separation, with the remaining through the fuel cooler 124 is illustrated in more detail in fuel being delivered to the fuel injectors 164. FIG. 6. As illustrated therein, the valve 126 has a body 128 A second embodiment fuel Supply system 106a is illus defining a chamber having at least one inlet 130 and an trated in FIG. 8. In the description and illustration of this outlet 132. The outlet 132 is defined by a pipe 134 extending embodiment, Similar parts have been given like reference into the chamber. A piston member 136 is movably posi 45 numerals to those used in the embodiment described above tioned in the chamber adjacent an end of the pipe. The piston and illustrated in FIGS. 1-7, except that an “a” designator 136 is sealed by an O-ring 138 or similar seal, preventing has been added thereto.

fuel from flowing therepast to the portion of the chamber on AS illustrated, this embodiment System is Similar to the the opposite side thereof The piston 136 is biased in the last. In this embodiment, however, a portion of the fuel direction of the end of the pipe 134 by a spring 140. An 50 delivered by the pump 118a through the line 120a is returned opposite end of the Spring 140 is positioned against a directly back to the vapor separator 116a (as governed by a retainer 142 mounted on the end of an adjuster 144. The valve 126a) without passing through a fuel cooler. Instead, spring 140 presses the piston 136 in the direction of the end a fuel cooler 124a is positioned along the portion of the line of the pipe 134, thereby having the natural tendency to close 120a leading to the high pressure pump 122a, cooling the the end of the pipe 134 and prevent the flow of fuel from the 55 fuel which is delivered directly thereto. inlet 130 through the chamber and out the outlet, in which In addition to those advantages described above, this case the fuel may be returned to the Supply through an embodiment fuel supply system 106a has the further advan alternative relief outlet 146. tage that all of the fuel delivered to the high pressure pump When the fuel pressure within the chamber reaches a 122a is cooled.

Sufficient level, the Spring force is overcome and the piston 60 A third embodiment fuel Supply system 106b is illustrated 134 is moved from the end of the pipe 134, permitting fuel in FIG. 9. In the description and illustration of this to flow through the outlet 132 (and, for example, to the vapor embodiment, Similar parts have been given like reference separator 118). numerals to those used in the above embodiments illustrated The adjuster 144, which threadingly engages the housing in FIGS. 1-8, except that a “b” designator has been added 128, may be used to move the retainer 142 towards and away 65 thereto.

from the end of the pipe 134. As may be understood, the In this embodiment, the fuel pump 118b delivers fuel closer the retainer 142 is moved to the end of the pipe 134, through a fuel line 120b to a fuel cooler 124b and thereon to

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the high preSSure fuel pump 122b. In this embodiment, a line 112e to the separator 116e. Preferably, the rate of fuel portion of the fuel delivered to the pump 122b is diverted delivery is controlled by a control pin 180e actuated by a back to the vapor separator 116b through a return line. The float 182e in the separator 116e. When the separator 116e is amount of fuel returned is governed by a valve 126b similar full, the float 182e rises upwardly, forcing the pin 180e to that described above and illustrated in FIG. 6. upwardly as well, blocking the incoming fuel line. This embodiment fuel Supply system 106b has the advan A water or cooling jacket 184e is formed within the body tage that vapor within the fuel delivered to the high pressure 178e of the separator 116e. Coolant “C” is delivered through pump 122b is diverted back to the vapor separator 116b the delivery line 174e into the jacket 184e. The coolant flows before being further preSSurized by the high preSSure pump through the jacket 184e, cooling the fuel within the Separator 122b. 116e, and then flows out an outlet to the discharge port 176e, as described above.

A fourth embodiment fuel Supply system 106c is illus Like the last embodiment, this embodiment has the trated in FIG. 10. In the description and illustration of this advantage that fuel cooling can be achieved with little embodiment, Similar parts have been given like reference modification to the outboard and engine motor, in that most numerals to those used in the above embodiments, except 15 motorS already generally include water cooling Systems for that a “c” designator has been added thereto. their engine. In addition, in this embodiment, the fuel cooler This embodiment is similar to that illustrated in FIG. 8, is incorporated into the vapor Separator, eliminating the need that a fuel return is provided after the fuel rail 162c. In for a separate Space consuming fuel cooler. particular, fuel is delivered through the fuel line 154c from In the embodiments of the invention described above, it the high pressure pump 122c through the filter 160c to the should be understood that the various fuel lines may com fuel rail 162c. Fuel which is delivered to the rail, but not prise any number of materials as known to those skilled in delivered by the injectors 164c is selectively returned to the the art. For example, the fuel lines may comprise rubber vapor separator 116c through a return line. A valve 156c is hose, metal piping, and even one or more passages formed preferably positioned at the end of the fuel rail 162c for within a portion of the engine Such as the cylinder block. controlling the preSSure in the rail and the amount of fuel 25 Of course, the foregoing description is that of preferred returned to the separator 116c. embodiments of the invention, and various changes and In addition to the advantages described above, this modifications may be made without departing from the Spirit embodiment has the further advantage that the valve 156c and Scope of the invention, as defined by the appended which is used to return a portion of the fuel to the vapor claims.

Separator 116c is also utilized to control the pressure within What is claimed is:

the fuel rail 162c. 1. A fuel Supply System for Supplying fuel from a fuel FIG. 11 illustrates an outboard motor 20d having a fuel Source to an engine powering an outboard motor, the engine Supply System 106d with a specific fuel cooling arrange having at least one combustion chamber, Said fuel Supply ment. With the exception of the fuel cooling arrangement, System comprising a vapor Separator to which fuel is deliv the fuel Supply system 106d is similar to that illustrated in 35 ered from the fuel Source for Separation of vapor from the FIG.8. Like reference numerals are used with to designate fuel, a pre-pressurizing pump for pressurizing fuel from the Similar parts in the description and illustration of this Separator and delivering Said fuel at a first preSSure above a embodiment to those of the embodiment illustrated in FIG. preSSure of Said fuel within Said vapor Separator to a high 8, except that a “d” designator has been added thereto. preSSure pump, Said high preSSure pump pressurizing Said In this embodiment, the fuel is cooled in the fuel cooler 40 fuel to a pressure above Said first preSSure and delivering 124d by cooling water drawn from the body of water in said fuel to a fuel injector for delivery into said combustion which the motor 20d is operating. chamber.

AS illustrated, cooling water is drawn through an inlet further 2. A fuel Supply System in accordance with claim 1, 170d in the motor 20d by a pump 172d. The pump 172d is including a fuel rail, and wherein Said high preSSure preferably powered off of a drive shaft 173d extending 45 pump deliverS Said fuel to Said fuel rail, and Said fuel injector between the crankshaft of the engine 22d and the transmis isSaid connected to said fuel rail, whereby fuel is delivered from rail to Said fuel injector.

Sion. Water is delivered through a delivery line 174d to the fuel cooler 124d. This water is used to cool the fuel passing furtherA including 3. fuel Supply System in accordance with claim 1, through the fuel cooler 124d, and then is drained back to the 50 between Said highapressure valve positioned along Said fuel System pump and Said fuel injector, Said body of water in which the motor 20d is operating through a drain port 176d. Valve arranged to divert at least a part of Said fuel delivered by Said Second high pressure pump back to Said vapor

This arrangement has the advantage that the fuel is cooled Separator.

before delivery to the fuel injectors 164d. In addition, since 4. A fuel Supply System in accordance with claim 1, most outboard motors have their engines provided with a 55 wherein Said pre-pressurizing pump is positioned within Said liquid cooling System already, Simply by providing a Small Vapor Separator.

amount of this coolant to a fuel cooler, the fuel cooling 5. A fuel Supply System in accordance with claim 1, advantages are achieved. further including a fuel cooler for cooling fuel delivered to Another fuel cooling arrangement is illustrated in FIGS. Said high pressure pump.

12 and 13. In the description and illustration of this 60 6. A fuel Supply System in accordance with claim 1, embodiment, like reference numerals have been utilized for wherein Said fuel cooler comprises a water-cooled Separator. like parts to those of the embodiments described and illus 7. A fuel Supply System in accordance with claim 3, trated above, except than an “e' designator has been added further including a fuel filter positioned between said valve thereto. and Said fuel injector.

In this embodiment, the fuel is cooled within the vapor 65 8. A fuel Supply System for Supplying fuel from a fuel Separator 116e. In this arrangement, the Separator 116e Source to a combustion chamber of an engine Said fuel includes a housing 178e. Fuel is delivered through the fuel Supply System comprising a vapor Separator, a first pump

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positioned within Said vapor separator for pressurizing fuel of Said fuel Supplied to Said inlet of Said high pressure pump to a first pressure and delivering fuel through a first fuel line by Said pre-pressurizing pump is returned to Said vapor to Second pump, Said Second pump preSSurizing Said fuel to Separator.

a pressure above Said first pressure and delivering Said fuel 14. A fuel Supply System in accordance with claim 8, through a Second fuel line to a fuel rail, a fuel injector wherein Said Second pump has an inlet and a portion of Said delivering fuel from Said fuel rail Said combustion chamber, fuel Supplied to Said inlet of Said Second pump by Said first and a valve for diverting a portion of the fuel delivered from pump is returned to Said vapor Separator. Said Second pump back to Said vapor Separator. 15. A fuel Supply System in accordance with claim 1, 9. The fuel Supply system in accordance with claim 8, wherein a portion of said fuel delivered by said pre wherein Said valve is pressure operated and positioned along preSSurizing pump is cooled by a fuel cooler and returned to Said Second fuel line. Said vapor Separator.

10. The fuel Supply system in accordance with claim 8, 16. A fuel Supply System in accordance with claim 8, wherein said second fuel line leads to a first end of said fuel wherein a portion of said fuel delivered by said first pump rail and Said valve is pressure operated at positioned at a is cooled by a fuel cooler and returned to Said vapor Second end of Said fuel rail. 15 Separator.

11. The fuel Supply system in accordance with claim 8, 17. The fuel Supply system in accordance with claim 16, further including a fuel cooler positioned along Said fuel wherein Said high pressure pump is positioned above a top Supply System between said vapor separator and Said Second end of Said engine.

pump. 18. The fuel Supply system in accordance with claim 13, 12. The fuel Supply System in accordance with claim 8, wherein Said engine includes a liquid cooling System, Said further including a fuel filter positioned along Said fuel System including at least one coolant jacket associated with Supply System between Said Second pump and Said fuel Said vapor Separator and into which cooling liquid is Sup injector. plied for cooling fuel in Said vapor Separator. 13. A fuel Supply System in accordance with claim 1, wherein Said high preSSure pump has an inlet and a portion k k k k k