I have a 95 ef fairmont and since the fuel pump relay internals fell out of their cover/housing and shorted out i can not get a true reading on the gauge or trip computer..
i have swapped out the sender unit on the fuel pump and also the trip computer but to no avail...
do you know if the problem could be in the actual vdo gauge micro computer in the dash or could it possibly be the body control module..
the gauge seems to have a mind of its own and reads empty around the half tank mark..
if you have a solution id be very appreciative..
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the ground fell off of the fuel pump or the plug came loose. its between the tank and frame. pull the wires down until u see the connector. unplug clean and plug in. I would check the fuse and relay first. usually there is another relay that is the same as the fuel pump in fuse box. switch them and see if it works
Either the pump relay is not working right, or the check valve in the pump is letting fuel drain back into the tank when you turn the engine off. You would check the pump relay to see if it is getting a ground signal from the computer when you first turn the key on, then look at base fuel pressure with a gauge if necessary.
The power comes from the ECM to the fuel pump and the injectors. These is a seperate fuse box under the hood for these items which will also house the relay for fuel pump. Start there and ensure your fuzes are good and your relay is switching. Some of the relays are the same to you can interchange them to make sure your fuel pump relay is working.
FRST OF ALL.RELIEVE FUEL PRESSURE.YOU CAN REMOVE FUEL PUMP BY REMOVING THE FLOOR COVER FROM THE LUGGAGE COMPARTMENT.MARK AND REMOVE HOSES FROM THE FUEL GAUGE SENDER.THEN LOOSEN THE FUEL GAUGE SENDER TO FUEL TANK.RETAINING RING. PULL OUT THE FUEL GAUGE FUEL PUMP ASSEMBLYFROM INSIDE THE ASSEMBLY HOUSING PULL OFF THE FUEL HOSES DETACH THE ELECTRICAL CONNECTIONS AND REMOVE THE GRAVITY VENT VALVE.PUT EVERY THING BACK VISA VERSA.AND CHECK FOR LEAKS.
There can be a couple of causes for no spark.
Common problem - Ignition unit in distributor has failed - Replace distributor.
Common problem - Coil failure - Replace coil.
Common Problem - Stuck ECU relay - indicated by no pulsing of injectors and no spark - replace relay.