RAM 3500 Truck 2WD L6-359 5.9L DSL Turbo VIN D FI (1998)
Fuel Pressure Regulator: Testing and Inspection
Injection Pump Overflow Valve
A sticking check valve within the overflow valve may cause low power. Refer to the Fuel Transfer Pump Pressure/Capacity Test. Overflow valve testing
is covered in this test.
Whenever the fuel injection pump is being replaced or removed for calibration, the overflow valve must stay with the pump. Make sure a new overflow
valve is used with a new or rebuilt injection pump and the old (original) overflow valve is returned to authorized repair facility with the old injection
pump.
Fig. 18 Installing Special Tools
Make sure the overflow valve is correctly installed at the fuel return line (pump outlet) (Fig. 18) and not incorrectly installed at the fuel supply line
(pump inlet).
