COUPLING VALVE STRUCTURE FOR FUEL SUPPLY MODULE

摘要

A coupling valve structure (26) is provided for a fuel supply module (20). The module has a fuel pump (20) disposed in a fuel reservoir (18), a feed line (21) in fluid communication with an outlet of the fuel pump for feeding fuel to a high pressure pump (16) and thus to an engine, and a return line (22) for retuning excess fuel from the engine or high pressure fuel pump to the reservoir (18). The coupling valve structure (26) includes a check valve (28) constructed and arranged to communicate with the feed line to permit fuel to be delivered to the engine and to prevent the fuel from draining back to the fuel pump, and a pressure relief valve (30) integrally connected with thw check valve via a conduit (23). The pressure relief valve (30) is constructed and arranged to communicate with the return line such that when pressure of the fuel at the check valve (28) is outside pressure range, the pressure relief valve will open to permit fuel in the conduit to enter the return line to thereby maintain fuel exiting the check valve within the certain pressure range.