Question about 1984 Chevrolet S-10

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Fuel gauge is inop and reads past full but still reads past full even with purple wire disconnected

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Single tanks or dual tanks, and if it is not working properly it will dive over the top end. Did one last week and it was a dual tank with a diverter valve that wasnt working right, and the sender wasnt getting contact either through the ground or the purple had to rewire both into an undisturbed part of the loom.

Posted on Aug 01, 2010

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1 Answer

Fuel gauge reads past full all the time


when the tank is full the resistance is low so the power through the gage make is read full
as the tank empties , the resistance increases so the less current means the gauge reads less until empty there is little or no power , the gauge reads empty
simple check , turn the ignition off, no power , no gauge reading

Sep 09, 2017 | Chevrolet S 10 Cars & Trucks

1 Answer

Fuel gauge reads past full all the time


float may be stuck up;Take tank unit out and check it with power on and observe the travel and relative gauge position.

Sep 09, 2017 | Chevrolet S 10 Cars & Trucks

3 Answers

Hello: my gas gauge is not working on my 1998 cavalier , any help any suggestions, thank you.


you should be able to find the fuel tank harness under the car near the fuel tank. If you look just in front of the rear axle on the drivers side you will see two connectors Unplug the connector with the grey, purple, black, and black/white wires.

Ground the purple wire. Turn the key to the run position. The gauge should read full. If it does you have a bad sending unit (the part in the tank that tells the gauge what the fuel level is at).

If the gauge still reads empty you have a bad gauge.

Apr 26, 2011 | 2005 Chevrolet Cavalier

1 Answer

Gas gauge is reading full at all times


fueltank sending unit inside fuel tank is broken or the wire is disconnect.when guage reads past full that means the guage is not getting a signal from fuel tank

Feb 14, 2011 | 1998 Ford Windstar

1 Answer

Faulty gas gauge


Most of the time its is the sending unit in the fuel tank. The test for it is to use a variable resistor that is hooked up to the wiring at the fuel tank and watch the fuel gauge if the gauge works ok thats makes 100% sure its the sending unit. At 245 ohms the gauge should read full, 180 ohms for 3/4 full, 160 ohms for 1/2 tank, 100 ohms for 1/4 tank and 42 ohms for empty. The color of wires at the fuel tank is purple wire and black wire. You can also use fixed value resisters. If the fuel gauge the wires from the sending unit to computer then to gauge for bad connections, shorts, broken wire and bad grounds. If the wires test ok that only leaves insterrment cluster or computer which even most dealers can't test eather one but the insterment cluster would be a more common problem then the computer. But about 95% of the time it will be the fuel level sensor in the gas tank that causes the problem. Good luck.

Jan 08, 2011 | 2000 Pontiac Grand Prix

1 Answer

Fuel guage reads on quarter full when tank is full. Im thinking sender unit but wanted to check first.


best way to test is to jack up the car support the rear with jack stands and wheel chock the tires so it doesnt roll, locate the wires to the fuel tank sender and unplug , gauge should go way past full unplugged revealing the gauge should be ok, ground the same gauge wire and the gauge should read past empty, this will test not only the gauges credibility but also the integrity of the wires and ground in the system.
If the gauge checks out good which 90% of the time they do, you must drain the fuel tank disconnect the fuel filler tube,and all fuel lines and electric connectors, unthread the fuel sender cover and remove the fuel tank sender and fuel pump assembly from the tank, seperate the two carefully in order to replace the fuel sender assembly, be careful not to bend the fuel float arm when assembling back into the tank, it is only a tiny rheostat that is controlled by the upward/downward motion of the float arm and can easily ruin the rheostat windings if the arm is forced too hard during installation.
Happy motoring!!

Jun 09, 2010 | 2004 Jaguar XJR-Series

2 Answers

The fuel gauge is'nt working.I tryed to ground it


When testing a fuel guage you should disconnect the wires to it,guage should read over full,ground the float wire,turn off key then turn back on should read empty.You have to cycle the key for guage to move.If still inop the wire is broken in the harness between the tank and the dash.Voltage on the float wire is low.When tested with a test light it will barely light the light and pulsate.This test indicates the wiring is good.

Apr 17, 2010 | 1991 Chevrolet C1500

1 Answer

Gas gauge has spun past full and appears stuck behind empty peg.


the fuel sending unit in the tank is a rheostat wrapped wire it increases the resistance read at the gauge the more fuel the more resistance.
what it sounds like is a dead short either in the sending unit or the wire running to it.
to check sending unit in the tank, locate the closest wiring harness plug (in the trunk/or under car) and disconnect then check gauge reading,remember ignition must be on.
try that and get back to me if needed

Nov 03, 2009 | 2004 Nissan Maxima

1 Answer

Fuel gauge reads full all the time


your ground wire from your fuel tank to the chassis has come disconnected

Jan 16, 2009 | 1991 Nissan Pathfinder

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