Diagnostic Aids

The following conditions may cause the fuel pump fuse to open:

• The fuse is faulty.
• There is an intermittent short to ground in the supply voltage circuit of the fuel pump.
• The fuel pump has an intermittent internal condition.
• If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the circuit status for the component with a scan tool. The circuit status parameter changes from OK or Indeterminate to Fault if there is a condition with the circuit or a connection.

The following table illustrates the ECM connector locations:

Listen for an audible hiss from the fuel pump when the fuel pump relay is commanded ON. A vibration in the fuel feed line when the fuel pump relay is commanded ON indicates that the fuel pump is operating.