Either the gauge itself, or the wire from gauge to tank, or the sending unit in the tank. Most of the time it is a problem with the sending unit.
They work like this: in the instrument cluster, a small voltage regulator sends low voltage through the gauge, into the wire to tank, and to the sending unit. The unit has a variable resistor that varies according to the fuel level, measured by the float arm attached to the unit. What it (the gauge) actually measures is resistance to ground-the current goes to a ground point after going through the variable resistor in the sending unit.
You can check if problem is the gauge or the sending unit by grounding the fuel gauge wire at the gas tank connector. Pull the electrical connector apart and locate the fuel gauge wire. Jumper that wire to ground on the frame while watching the fuel gauge needle for movement. DO NOT ground it for more than a split second, just touch to ground while someone watches the gauge. If the gauge needle moves at all (will probably go to full or empty), then the problem is the sending unit in the tank. The gauge is good, so is the wire from gauge to tank. I should mention that doing this test can possibly blow the meter (gauges) fuse in the fuse panel- why I said to do it just for a brief moment.
SOURCE: replaced fuel pump w/ aftermarket , now fuel gauge not working
Did you change the 'sending unit' and gauge with the pump? If not, consider doing this.
SOURCE: fuel gauge doesnt work. Put in new fuel pump, no f...
Common issue on the 03-06 Rendezvous instrument clusters, usually it's caused by failing stepper motors on the cluster's circuit board and can be repaired. Check out this page for info on how to get it fixed - Rendezvous fuel gauge doesn't work
SOURCE: what coulda caused my fuel gauge to quit working on my 1995 jeep cherokee sport?
Dear Josh Wambles,
Some of these units suffer with stuck floats in fuel tanks, so the best thing you can do is drain out your fuel tank properly, then fill it with water and then try and get a reading, as the tank is filled, the float rises, electrical resistance is altered and as a result, you get a reading on your guage. If filling with water and cleaning out the tank doesnt work, then im afraid you are going to be dismantling the device that is attached to the tank and you will be checking that; but just before you do, try removing the guage itself and putting a multimeter to the wires and see if you have a reading, if you do, your guage is trashed, get a new one. If not, then as said, you will be busy with the float and other components that are probably fitted inside the tank.
What can cause this?
Corrosion, running your car too low on fuel, busted electrical connections, water, sediment in the tank, rubbish fuel, bad maintenance.
I hope this is the fixya for you and I look forward to hearing how you get on, in the meantime, if you have any further questions, then do let me know and I will respond as quickly as I can.
Yours Sincerely
Ouszen
if it worked for a short period of time after doing the pump/sending unit the check the connections going to the pump/sending unit they would have been moved around doing the pump
incorrectly and half assed installed. putting a fuel pump in a chevy is very difficult and takes patients. most mechanics dont have that so go to another shop and make sure they fix the problem before you pay.
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