Claims
- 1. A fuel system comprising:a fuel tank; a least one fuel injector; a supply pump fluidly positioned between said fuel tank and said at least one fuel injector; a fuel return passage with an upstream end fluidly connected to said at to said at least one fuel injector; a fuel filter fluidly positioned between said supply pump and said at least one fuel injector; a pressure regulating valve fluidly positioned between said at least one fuel injector and said fuel tank; and a bypass flowpath that circumvents said at least one fuel injector and said pressure regulating valve, and passing gas flow without restriction, but passing liquid flow with restriction.
- 2. The fuel system of claim 1 wherein said bypass flowpath is unobstructed.
- 3. A fuel system comprising:a fuel tank; a least one fuel injector; a supply pump fluidly positioned between said fuel tank and said at least one fuel injector; fuel filter fluidly positioned between said supply pump and said at least one fuel injector; a pressure regulating valve fluidly positioned between said at least one fuel injector and said fuel tank; a bypass flowpath that circumvents said at least one fuel injector and said pressure regulating valve, and passing gas flow without restriction, but passing liquid flow with restriction; said bypass flowpath includes a first bypass passageway that circumvents said at least one fuel injector; and said bypass flowpath includes a second bypass passageway circumventing said pressure regulating valve.
- 4. The fuel system of claim 3 wherein said first and second bypass passageways are disposed a common housing.
- 5. The fuel system of claim 4 wherein said common housing is a portion of a filter head assembly.
- 6. The fuel system of claim 5 wherein an inlet to said first bypass passageway is located elevationally above said filter.
- 7. The fuel system of claim 3 including a priming passage circumventing said supply pump; anda priming pump positioned in said priming passage.
- 8. The fuel system of claim 3 wherein said first bypass passageway is a siphon brake with respect to fuel adjacent said at least one fuel injector.
- 9. The fuel system of claim 8 wherein said fuel adjacent said at least one fuel injector is located in a cylinder head.
- 10. The fuel system of claim 3 wherein said first bypass passageway positioned elevationally above an inlet to said at least one fuel injector.
- 11. The fuel system of claim 3 wherein an inlet to said first bypass passageway is located elevationally above an outlet from said filter.
- 12. A method of priming a fuel system, comprising the steps of:pumping liquid fuel from a tank toward at least one fuel injector at least in part with a supply pump; circumventing gas at a low pressure around the at least one fuel injector and a pressure regulating valve to the tank via an unobstructed bypass flowpath; and increasing liquid fuel pressure in the fuel system to a high pressure with the supply pump.
- 13. A method of priming a fuel system, comprising the steps of:pumping liquid fuel from a tank toward at least one fuel injector at least in part with a supply pump; circumventing gas at a low pressure around the at least one fuel injector and a pressure regulating valve to the tank via a bypass flowpath; and increasing liquid fuel pressure in the fuel system to a high pressure with the supply pump; said pumping step includes the steps of pumping liquid from the tank toward the at least one fuel injector with a priming pump; and then pumping liquid from the tank toward the at least one fuel injector with the supply pump.
- 14. The method of claim 13 including a step of introducing gas into the fuel system before the pumping step at least in part by replacing at least one of a fuel filter and a fuel injector.
- 15. The method of claim 14 including a step of starting an engine;restricting flow of liquid fuel through the bypass flowpath after the starting step.
- 16. The method of claim 15 wherein the circumventing step is performed within a fuel filter assembly.
- 17. The method of claim 16 wherein the step of pumping liquid fuel with a priming pump includes a step of circumventing the supply pump.
- 18. The method of claim 17 including a step of maintaining the pressure regulating valve in a closed position during the circumventing steps; andmaintaining the bypass flowpath open after the starting step.
- 19. A common housing for a fuel system comprising;adapter having a supply passage and a return passage disposed there through; a first bypass passageway disposed in said adapter and fluidly connecting said supply passage to said return passage; and a second bypass passageway that is unobstructed, is disposed in said adapter and fluidly connecting an upstream portion to a downstream portion of said return passage.
- 20. The common housing of claim 19 wherein said adapter is a portion of a filter assembly.
RELATION TO OTHER PATENT APPLICATION
This is a continuation of application Ser. No. 10/335,594 filed Dec. 31, 2002 with the same title, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1359466 |
Dec 1987 |
SU |
Continuations (1)
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Number |
Date |
Country |
Parent |
10/335594 |
Dec 2002 |
US |
Child |
10/379062 |
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US |