Fuel Pump Capacity Test
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Dodge Ram Wagon, 1999 Dodge Ram Van, 1999 Dodge Pickup, 1999 Dodge Durango, and 1999 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Perform FUEL PUMP PRESSURE TEST before performing FUEL PUMP CAPACITY TEST. Perform FUEL PUMP CAPACITY TEST in conjunction with FUEL PRESSURE LEAKDOWN TEST. See FUEL PRESSURE LEAKDOWN TEST.
- Release fuel system pressure. See FUEL PRESSURE RELEASE. Remove air cleaner housing (if necessary) to access quick-connect fuel fittings. Disconnect fuel supply line quick-connect fittings at fuel rail. Connect Fuel Line Pressure Test Adapter (6539) for 5/16" fuel lines, or Fuel Line Pressure Test Adapter (6631) for 3/8" fuel lines, to the disconnected fuel supply line.
- Insert other end of Fuel Line Pressure Test Adapter into a graduated container. Remove fuel filler cap. Using DRB scan tool, actuate ASD FUEL SYSTEM TEST. This should activate fuel pump and pressurize system. Fuel pump should deliver at least .25 L of fuel in 7 seconds. If capacity is lower than specification, but fuel pump can be heard through fuel filler, check for a kinked or damaged fuel supply line between fuel rail and fuel pump module. Go to next step.
- If fuel supply line is not kinked or damaged and fuel pressure is okay, but capacity is low, replace fuel filter/fuel pressure regulator. Fuel pressure regulator can be replaced separately on some models. If both fuel capacity and pressure are low, replace fuel pump module assembly. See FUEL PUMP MODULE under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION - TRUCKS & RWD VANS - GASOLINE article.
NOTE:
DO NOT operate fuel pump for longer than 7 seconds.