3500 4x4 Pickup L6-359 5.9L DSL Turbo (1996)
Fuel Pressure: Testing and Inspection
Fuel Transfer Pump Pressure Test
For operation of the fuel transfer pump primer button, refer to Fuel Pump/Description and Operation.
Fuel Heater And Temperature Sensor Location
The fuel transfer pump is located on the left side of the engine and above the starter motor.
An improperly operating fuel transfer pump can cause low engine power and/or hard engine starting. Inspect the fuel supply line to the pump for
restrictions, kinks or leaks.
Fuel leaking from the weep hole in the pump casing indicates a leaking pump. The transfer pump must then be replaced or rebuilt.
Do not operate the fuel system with a fuel line or component suction restriction of more than 100 MM Hg (4.0 inch Hg).
Low transfer pump output can be caused by a worn eccentric on the engine camshaft.
The maximum allowable fuel pressure drop across the fuel filter/water separator is 35 kPa (5 psi). As the filter removes contaminants in the fuel, the
pressure drop across the fuel filter/water separator will increase. Frequent replacement of the filter may indicate a worn transfer pump. The
filter/separator can be checked with a fuel pressure gauge. For test procedures, refer to Fuel/Water Separator/Testing and Inspection/Procedures.
Output Pressure Test
