RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 7 (2001)
Fuel Inlet Metering Valve: Description and Operation
Fig. 58 Overflow Valve Location
OVERFLOW VALVE
The overflow valve is located on the side of the injection pump (Fig. 58). It is also used to connect the fuel return line (banjo fitting) to the fuel
injection pump.
Fuel volume from the fuel transfer (lift) pump will always provide more fuel than the fuel injection pump requires. The overflow valve (a check
valve) is used to route excess fuel through the fuel return line and back to the fuel tank. Approximately 70 % of supplied fuel is returned to the fuel
tank. The valve opens at approximately 97 kPa (14 psi). If the check valve within the assembly is sticking open, fuel drainage of the injection
pump could cause hard starting.
If a Diagnostic Trouble Code (DTC) has been stored for "decreased engine performance due to high injection pump fuel temperature", the
overflow valve may be stuck in closed position.
