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A combination check and vent valve assembly for an automotive engine fuel system. The valve assembly has a fuel passage through a housing with an inlet communicating with a fuel pump outlet and an outlet to supply fuel to the engine. A check valve is disposed within the fuel passage which is normall

A combination check and vent valve assembly for an automotive engine fuel system. The valve assembly has a fuel passage through a housing with an inlet communicating with a fuel pump outlet and an outlet to supply fuel to the engine. A check valve is disposed within the fuel passage which is normally closed when the fuel pump is not operating, and will open when the inlet fuel pressure exceeds the outlet fuel pressure. A normally closed vent valve is disposed within the fuel passage upstream of the check valve and serves as a moveable seat for the check valve, which will open when the valve assembly outlet fuel pressure is greater by a predetermined value than the fuel pump outlet pressure to bleed fuel through the passage and to the pump to reduce the outlet fuel pressure to a predetermined minimum pressure.

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For a no-return fuel system for an engine with at least one fuel injector and a fuel pump with an inlet constructed for communicating with a reservoir of liquid fuel and an outlet providing fuel at an increased pressure, a valve assembly comprising, a housing, a fuel passage through said housing hav

For a no-return fuel system for an engine with at least one fuel injector and a fuel pump with an inlet constructed for communicating with a reservoir of liquid fuel and an outlet providing fuel at an increased pressure, a valve assembly comprising, a housing, a fuel passage through said housing having an inlet constructed to communicate with the outlet of the fuel pump and an outlet for supplying liquid fuel to the engine fuel injector, a check valve in said fuel passage constructed and arranged to be normally closed when the fuel pump is not operating, and to open when the fuel pressure at said housing inlet exceeds the fuel pressure at said housing outlet, and a vent valve in said fuel passage communicating with said housing outlet and housing inlet, said vent valve having a vent valve seat fixed in said housing and a vent valve body in said fuel passage and movable relative to said housing and said vent valve seat to open and close said vent valve, and constructed and arranged to be normally closed and to open when the pressure of fuel at the housing outlet is greater than both a predetermined minimum pressure and the fuel pressure at the fuel pump outlet to bleed fuel through the passage in the housing and through the fuel pump outlet to reduce the pressure of the fuel at the housing outlet to such predetermined minimum pressure, and said check valve having a check valve seat on and movable in unison with said vent valve body and a check valve body movable relative to said housing and said vent valve body and yield yieldably biased by a preload onto said check valve seat to close said check valve.