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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Just a heads up: there is both a fuel pump relay AND a pump fuse, both are in the power distribution box. A relay is not a fuse, but a power switching device. The internal switch (called the coil side of relay) will let power pass through the relay when the coil (the "switch") is activated.
Look for locations on the underside of the fuse/relay block cover-this is the Power Distribution Center. Also, your owner's manual will show relay and fuse locations. Still no help? Ask at a dealer, a parts person should be able to get a copy of fuse/relay locations for your '95.
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.
didnt specify year of vehicle most relays for tahoe is under hood and at side of dash on drivers side -- turn key to on and listen for hum of pump no hum try starting with starter fluid if starts test for power to connections ,pump and relay if power more than likely pump shot
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.
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.