Question about 1988 Chevrolet C2500

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Gas gage on 89 chevy c2500 quit working but fuel pump still works is the sending unit bad?

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Could be sending unit,wiring,or the gauge itself.I would check the wiring first.

Posted on Nov 19, 2009

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I didn't see an s15 in that model year, in my database?
If the speedometer works but the tach doesn't, I think something is wrong with instrument cluster?
GM has had a problem with fuel gage sending units. The sending units are not hard wired to instrument cluster, they send signal to pcm, the pcm sends serial data to instrument cluster, telling the cluster the gage settings.
It may be possible to use different size resistors in place of the fuel level sending unit, to see if fuel gage reacts properly to different resistors, if the gage reacts properly, then I think the problem is the fuel gage sending unit.

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This problem is caused by a defective fuel gage sending unit, the sending unit is located inside the fuel tank and is part of the fuel pump module but is sold separately in a kit from ACDelco, to replace the fuel gage sending unit requires the fuel tank be removed from the car. Below is a price and part number courtesy of rockauto.com


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1997 Jetta 3 , fuel injected fuel Gage stays empty, when I turn the ignition on gage moves up to zero/empty and no more,I have checked float unit with multimeter and the output is OK, but no voltage coming...


Gauge is not connected to any relay,its a signal from the fuel pump sending unit, you do not get voltage from that wire for the sensor you need to use a multimeter and test for ohms, every manufature is different and cant recall what it should be empty or full.

Get a shop manual or even call the local repair shop/dealer and they might give you the information you are looking for, but sounds like you have a bad sending unit and need to replace it as an Assembly.

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My 2008 chevy malibu fuel gauge dose not read only some times when its a full tank the gauge is dead but about 1/4 tank it reads but gos in and out ?


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MY GAS GAGE ON MY 1999 CHEVY VENTURE DOESN'T WORK. IT ALWAYS SAYS FULL. DO I NEED TO REPLACE THE WHOLE GAS TANK?


NO, on the fuel pump assembly is a swinging type arm with a float on the bottom end and some metal teeth on the other, as the fuel leval goes up or down these teeth contact a plate on the body of the fuel pump assemby that send a signal to the gauge. Now either your float arm is sticking, guage is bad, or the sending unit is bad. I would suggest the sending unit, it is availble as a repair unit, you dont have to buy the whole fuel pump. The gauges usually last the life of the car.

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1 Answer

Fuel gage not working .Gage goes up and down even when full of gas. Any suggestion, 180,000 km thanks Tony


The sending unit is bad and it is internal to the fuel tank. Does not appear to be available separately but only available with the fuel pump as a complete unit. Bad news... it is quite expensive. Two part suppliers I've checked run from $286 to $321 (depending on the warranty), plus you'll have to drop the fuel tank to install it or pay to have it done. Might be a tough decision to decide if it's worth repair or just to live with it.

If this answers your question then please take a moment to rate this post.

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2001 chevy impala gas gage does not work right


sokol520--Sounds like fuel pump/fuel guage sending unit. They are integrated and located inside the fuel tank, most likely.

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I have a 94 chevy s10 and my gas reads empty while i drive.but when i shut off the truck the gauge moves to different readings.


Is......the problem--"the gas gage reads empty when there is fuel in the tank. OR, The gage moves when the key to turned off ?

If it's the first,
You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.

If its the second ? - Electrical gauges will move when powered down. Normal

Testing the gauge may not be easy - just depends on your ability.
It is a simple 2-wire gauge circuit, when disconnect (usually need the fuel tank) the gage reads in one direction (either full or empty)
then when shorted-the gage reads in oppisite direction.

Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.

A quick method I have used to check the in-take part of the gauge is this.
1st. know there is gas - 1/2 tank works best.
2nd driver's door open, key in run position, engine not running.
3rd gently lift up on the door then let if come back down, gently.
just enough to cause the gas to slosh around.
4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.

Of course, if the gage never leaves empty - sloshing won't work.
I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.

Let us know.

Dave

Feb 28, 2009 | 1996 GMC Sonoma

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