3500 4x4 Pickup V10-488 8.0L Magnum (1994)
Fuel Pressure: Testing and Inspection
Fuel Pump Capacity Test
Before performing this test, verify fuel pump pressure by performing the previous tests.
1. Release the fuel system pressure from fuel system. Refer to Fuel Pressure Release Procedure.
2. Disconnect the fuel supply line at fuel rail. The fuel line-to-fuel rail connection is made at the rear of the engine. Remove air cleaner housing
before tool connection.
3. Connect Fuel Line Pressure Test Adapter Tool number 6631 (3/8 in.), or number 6539 (5/16 in.) into the disconnected fuel supply line (tube).
Insert the other end of Adapter Tool 6631 or 6539 into an approved gasoline container.
4. Use the DRB scan tool to activate the fuel pump and pressurize the system.
5. A good fuel pump will deliver approximately 2 liters of fuel per minute.
