If a sensor had gone down . You would be getting a code (MIL showing). Are you getting any power at all to the fuel pump? It should buzz for 10 seconds on initial key to ON position. It's not a sensor stopping the pump from priming. It could be the
Fuel Pump Monitor (Models Without Fuel Pump Driver Module)
The Fuel Pump Monitor (FPM) circuit is spliced into the Fuel Pump Power (FP PWR) circuit and used by the PCM for diagnostic purposes. The PCM sources a low current voltage down the FPM circuit.
With the fuel pump off, voltage is pulled low by the path to ground through the fuel pump. With fuel pump off and the FPM circuit low, the PCM can verify the FPM circuit and FP PWR circuit are complete from the FPM splice through the fuel pump to ground.
With the fuel pump on, voltage is supplied from the fuel pump relay to the FP PWR and FPM circuits. With the fuel pump on and FPM circuit high, PCM can verify FP PWR circuit from fuel pump relay to FPM splice is complete. It can also verify that fuel pump relay contacts are closed and battery voltage is supplied to fuel pump relay.
Fuel Pump Monitor (Models With Fuel Pump Driver Module)
The Fuel Pump Driver Module (FPDM) communicates diagnostic information to the PCM through the Fuel Pump Monitor (FPM) circuit. This information is sent to the PCM as a duty cycle signal. PCM uses this signal to verify FPDM is powered and able to communicate on the FPM circuit.
Monday, December 8th, 2008 AT 10:13 AM