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Gas tank ground wire - GMC Cars & Trucks

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Inside the gas tank,

Posted on Nov 02, 2012


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I replaced the gas tank on a 1988 ramcharger now the gas gage dose not work it was working before


You can ground the wire going to the gauge at the tank to see if the circuit is good. Grounding the wire should make the gauge move. Then check resistance on that wire going into the tank. It could be a broken circuit inside the tank.

Oct 04, 2015 | Cars & Trucks

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Gas gauge won't work and it has a full tank of gas. Is there a fuse I can change.


There might be but it is unlikely a fuel gauge is fused alone; usually if it is a fuse other things will stop working too but I suggest you are guided in this matter by your car handbook.

Problem is probably wiring and in particular the grounding of the fuel tank sender unit. It could be a faulty sender but they are usually quite reliable.

Test by disconnecting the wire from the sender unit at the fuel tank and short to a good ground and the gauge should read full. If the gauge wire is in a block with other wires it will be necessary to positively identify the gauge wire before testing.
If the gauge reads refit the wire and duplicate the ground wire to a known good ground. If the gauge still reads the fault is a bad ground to the tank sender unit and if it doesn't the sender unit itself is probably faulty.

If grounding the gauge wire does not produce a reading the fault is the wiring to the tank, the supply to the gauge or a problem with the gauge itself.

Feb 06, 2015 | Cars & Trucks

1 Answer

Where is the anti slosh module in a 1988 mercury grand Marquis ?


Anti slosh module? I've never heard of that. If there is such a thing, it must be on the fuel level sending unit in the tank. It is usually the sending unit at fault when the gas gauge stops working.

Here's how to check if the problem is the sending unit or the gauge in the cluster: you will need a helper to watch the gas gauge needle. Pull the electrical connector apart at the tank, find the gas gauge wire. The power wire for the fuel pump is pink and black, and the ground for it is a black wire, so the fuel sender wire should be a different color. When you figure out which wire is for the gas gauge, turn the key to on, and take a jumper wire and ground the gas gauge wire to the frame. Have a helper watch the gas gauge needle when you ground the wire: the needle should move perceptibly. If it does, the gauge in the cluster is good, and the problem is with the sending unit in the tank. If grounding the wire does not make the needle jump, the problem may be the gauge in the cluster. Be sure that you have made a good contact with ground with the jumper wire.
There is a small match box size voltage regulator on the back of the cluster. This sends low voltage (about 5 volts) through the gas gauge and on to the wire going to the tank. When you ground this wire, it should cause the gauge needle to go either to full or to empty, but you should see the needle move. Remember, key on, then ground the wire. Any movement of the needle means the gas gauge is probably good, and the problem is the sending unit in the tank.

Oct 24, 2014 | 1988 Mercury Grand Marquis

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What can I do to troubleshoot a gas gauge does not work on a 1977 Dodge


If your other dash gauges work, which eliminates the gauge fuse, what you need to do first is determine whether it's the "sending unit" which is in the gas tank. This may not be easy as you may have to lower the gas tank to get to the wires that attach to the sending unit. If you're lucky, the wires may have a connector visible close to the tank. There will be one or two wires. Disconnect them, and then have someone turn the ignition on while they watch the gas gauge. While they watch, ground the wires one at a time to a good, relatively clean metal part of the frame. You may need to use a length of wire connected to a good ground on one end, and touch the other end to each tank wire one at a time. If you dash gas gauge is good, when you ground one of the wires the gas gauge will go all the way to the "full" limit.
If that happens, the gas-tank sending unit is probably bad. If there are two wires going to it though, you need to make sure neither one is broken somewhere. If the gas gauge does NOT go all the way to "full", then you have either a bad wire or a bad gauge.

Jun 01, 2014 | 1994 Dodge Dakota Club Cab

2 Answers

How do i know i have a bad float in dual tanks?


Of readings are inconsistent with known fuel levels, Ground (or connect to a tester light) the sender unit wire and watch if the gauge rises.

May 20, 2014 | 1985 Ford F150

1 Answer

Where is the fuse for peril gauge in a Citroen c1


Find the problem? No separate fuse for the gas gauge, if the rest of dash and gauges work (the temperature gauge), not a fuse problem.


Take off the electrical connector at the gas tank, find the wire for the fuel sender unit in the tank to the gas gauge, and ground it temporarily to the car body, with the key ON. If the gas gauge needle jumps when grounding the wire, the gauge is good, and the problem is with the sender unit in the tank.

May 10, 2014 | Cars & Trucks

1 Answer

Where is the gas tank ground wire on a 1972 grand prix


The gas tank ground wire normally attachs to the center plate with the fuel lines and sending unit. Often its just a flat slide on prong so the wire usually stays attached to the body when the tank comes off the car. I have seen situations where the tab has rusted completely off the sending unit, but in order for it the sending unit to work, it has to be grounded.

Sep 13, 2013 | Cars & Trucks

1 Answer

The gas gauge for the front tank on my 1992 F150 is stuck past full


You probably have a ground wire not making contact to ground on the front tank sending unit. OR the sending unit itself inside the tank is faulty. Either way, when a gas guage goes to full all the time (empty or full), this indicates that NO ground is available for the sending unit.

Apr 02, 2013 | 1992 Ford F150 SuperCab

1 Answer

Where is the gas tank ground wire for 1995 ford explorer


Not exactly sure when you say "in gas tank". There are 2 seperate grounds for the fuel pump/sending unit inside the fuel tank. The ground for the fuel pump is located under the left hand (drivers) side of the instrument panel behind the kick panel. The ground for the sending unit is located on the left hand (drivers) side of the engine compartment near the radiator. Sorry I don't have any pictures and I hope this helps....

Nov 15, 2012 | 1995 Ford Explorer 4.0

1 Answer

Fuel gauge worked a week ago now nothing not the fuses.


the fuel level float in the gas tank needs a good ground. make sure that one of the wires is well grounded. quick test .....take the wire from the fuel tank sender and touch to ground momentarily while someone watches the gas guage. if it moves then look for bad ground.

Nov 03, 2010 | 1984 Cadillac DeVille

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