Clean area around overflow valve and fuel return line at Bosch VP44 injection pump before removal.Ģ. If a Diagnostic Trouble Code ( DTC) has been stored for “ P0168 decreased engine performance due to high injection pump fuel temperature”, the overflow valve may be stuck in closed position.Ī rubber tipped blow gun with regulated air line pressure is needed for this test.ġ. If the check valve within the assembly is sticking open, fuel drainage of the Bosch VP44 injection pump could cause hard starting. The valve opens at approximately 97 kPa (14 psi). Approximately 70% of supplied fuel is returned to the fuel tank. The overflow valve (a check valve) is used to route excess fuel through the fuel return line and back to the fuel tank. It is also used to connect the fuel return line (banjo fitting) to the Bosch VP44 injection pump for your Cummins powered Dodge truck.įuel volume from the fuel transfer (lift) pump will always provide more fuel than the fuel injection pump requires. The overflow valve is located on the side of the Bosch VP44 injection pump.
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