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A bypass pressure control unit for use in bypass relation to a fuel delivery line of a pump operated fuel delivery system for an internal combustion engine. The unit includes a housing that encloses a flexible diaphragm valve for defining with the housing a first bypass outlet chamber and a second f

A bypass pressure control unit for use in bypass relation to a fuel delivery line of a pump operated fuel delivery system for an internal combustion engine. The unit includes a housing that encloses a flexible diaphragm valve for defining with the housing a first bypass outlet chamber and a second fuel inlet chamber. The housing has a fuel inlet for communicating the second chamber with the fuel delivery line. The regulating valve is a flexible diaphragm membrane biased by a spring into direct engagement with a relatively large diameter valve seat formed in the housing so that the diaphragm itself acts as a valve member. The diaphragm is movable against spring force by a given pressure of fuel in the second chamber to disengage the diaphragm from the valve seat to thereby communicate the second chamber with the bypass fuel outlet. In one embodiment, the fuel outlet is formed in the housing and has a restricted orifice downstream of the valve seat. In a second embodiment, the fuel outlet is formed in the diaphragm itself so that bypass fuel is communicated to the first chamber from the second chamber through the diaphragm orifice and through an opening in the spring chamber of the housing back to the fuel canister. The unit is operable in an engine fuel system as a bypass maximum pressure relief control, a pulse dampener, fuel accumulator, closed system fuel pressurizer and/or system continuous bypass pressure regulator.

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[ What is claimed is:] [1.] A method of delivering fuel to an internal combustion engine that includes:a fuel supply with a fuel pump responsive to application of electrical power for supplying fuel under pressure,fuel delivery means on the engine,a fuel line having one end connected to an outlet of

[ What is claimed is:] [1.] A method of delivering fuel to an internal combustion engine that includes:a fuel supply with a fuel pump responsive to application of electrical power for supplying fuel under pressure,fuel delivery means on the engine,a fuel line having one end connected to an outlet of said pump and a second end connected to said fuel delivery means,a check valve in said fuel line for preventing reverse flow of fuel from said delivery means to said pump,fuel bypass means coupled to said fuel line between said second end of said fuel line and said check valve for providing a regulated fuel bypass flow path from said pump outlet parallel to said line, such that fuel continues to flow through said bypass means and said pump continues operation in the absence of fuel demand at said fuel delivery means, said method comprising the steps of:(1.) providing a flexible diaphragm valve made from a planar sheet of flexible fuel impervious material of uniform thickness and an associated rigid annular valve seat,(2.) arranging said diaphragm to be in continuous communication with the fuel delivery line,(3.) arranging said valve seat relative to the diaphragm valve to form an annular valve seat barrier to control communication between the fuel line and the bypass flow path by flow of fuel radially inwardly of and across said annular valve seat and between said diaphragm valve and valve seat,(4.) yieldably biasing said diaphragm to directly bear on said valve seat to sealably isolate the fuel line from the fuel bypass path,(5.) causing said diaphragm valve and valve seat to operate conjointly such that when force of fuel pressure in the fuel line overcomes the biasing force exerted on said diaphragm, said diaphragm is disengaged from said valve seat to open communication of the fuel line with the fuel bypass outlet path via said valve seat, and vice versa when the spring force overcomes such fluid pressure force.