Question about 1990 Chevrolet C1500

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I need wiring diagram for my 1990 chev. truck. Fuel gage show full all the time when I know its not !

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Look at wiring on top of fuel tank at the connection- either ground rotted off or bare wires touching or a crushed connector

Posted on May 25, 2011

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Posted on Jan 02, 2017

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My 1990 k1500 temp gauge shows max temp all the time even if I unplug it from the sensor


you may have a temp sending unit for the temp gage, one wire and then a separate cts sensor that sends info to the computer, two wires.

With the one wire unit, take the wire loose, key on, see if any voltage on the wire, use digital multimeter. If no voltage, it could be wiring circuit or gage itself.

Feb 22, 2015 | 1990 Chevrolet K1500

1 Answer

Suzuki grand vitara 2008 fuel gage problem


i cant sort this,
the tank does not get full (physically ) at the station pump
the fuel gage shows empty for full or full when empty ?
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or MPG low?
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Jul 07, 2014 | Suzuki Grand Vitara Cars & Trucks

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I just need to know what color wire off the fuel pump controls the fuel gage


What year car? The factory changes colors or wiring frequently year to year.

Mar 15, 2014 | Mercury Cougar Cars & Trucks

1 Answer

Fuel gage on my 01 couger does not work but the low fuel light on the gage is on would like to know what the wiring diagram is and if anyone can give advice on where to go from here


check power to the sender unit in the fuel tank may be a break in the wire in your trunk/boot. if not change the sender unit.

Dec 27, 2013 | Cars & Trucks

1 Answer

Gas guage shows over full all the time


You have lost the ground input to the gas gage. Its the black wire coming from the fuel pump connector at the fuel pump. Either the wire is broken or the input to the body control computer is broken, thus creating high Resistance on the input wire. The computer will think the tank is full, a shorted wire would indicate lo Resistance and read empty. Locate the fuel pump connector and jumper the black wire directly to the body (ground) and turn the key to run, check gage. If reads normal the wire is broken betwwen fuel tank and its ground location.

Jan 29, 2011 | 2000 Pontiac Firebird

2 Answers

No power to fuel pump 1990 eagle talon tsi awd turbo 5 speed. checked all fuses and ecu for damage and all seems fine, new fuel pump so i know thats the the problem the mpi/mfi relay is not clicking when...


I hope this helps? Are you missing anything else? Engine cranking you have spark at the plugs and fuel injector pulse? Any applicable trouble codes? Battery has a full charge? See load side of mfi relay, that line with arrow head, with key on, good voltage at upper wire? If so, if you use a jumper wire between proper wire colors, the pump should run.
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Jul 03, 2017 | 1990 Eagle Talon

1 Answer

Gas gage show full all the time


it could be the cluster. but first find out if the pump and the sender unit is one. you may have not disconnected the right plug if you did disconnect the right plug your instrument cluster could be bad

Apr 26, 2010 | 2000 Buick LeSabre

1 Answer

Fuel gage is showing backwards shows full when emtey and emtey when full


sounds like a couple of wires are crossed(mis-wired) or the float in the gas tank on the fuel pump may need replaced. While I am not familiar with this particular Brand - I suggest taking it to the dealership.

Mar 31, 2009 | 2001 Audi A4

1 Answer

I can not find any wiring diagram that shows the correct fuel module connector (7 pin). Gage stays pegged beyond full, and fuel low light will not illuminate, even when usable fuel in tank is exhausted....


sounds to me that the gas tank is not grounded or 12v was supplied to sender unit wire and damaged fuel gauge

run a ground wire from battery neg (black) post to clean metal on tank

Mar 19, 2009 | 2001 Chevrolet Astro

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