Question about Chevrolet C2500

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On my 93 silverado when i turn lights on the gas gauge miss reads and looses a quarter tank but when off it goes back to normal?

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  • 100 Answers

I think your alternator reg is going bad man. take it to autozone and have it tested as well as the battery before it leaves you stranded. i hope that helps have a good one

Posted on Oct 24, 2012

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6ya6ya
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Posted on Jan 02, 2017

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MikenAsh
  • 32 Answers

SOURCE: gas gauge

The float that moves the gas hand is possibly stuck in the tank. If there's isn't an access hole in the rear of the vehicle you'll have to drop the tank. Unless it becomes free on it's own. Hope this is helpful. Please rate. Thanks

Posted on Sep 28, 2008

  • 51 Answers

SOURCE: wrong reading on fuel gauge

Normally this problem is due to a bad sending unit. The sending unit is the actual device which transmits the level of fuel in the tank to your fuel gauge. The most common cause is a stuck float. The device works by means of a flotation device, often made of a petroleum resistant plastic encasing a foam or cork "float, " which is attached to a light weight metal arm. The arm moves as the float raises and lowers with the level of fuel. This arm connects to a switch which increases and decreases resistance in the circuit. If the arm is stuck or if the float is allowing fuel in it you will get an inaccurate reading. A "logged" float (one filled with fuel) usually reads below the level, whereas an arm which is sticking will read above the level. Now, if the gauge has been reading this way since the car was brand new, the other likely cause is that the needle may have been improperly placed on the gauge at the factory, or the windings in the gauge may be under or over wound causing the inaccurate reading. If you are mechanically inclined you may be able to replace the sending unit yourself. Keep in mind this can be a dangerous procedure for a first time mechanic as it may involve removing the fuel tank from the vehicle. Some vehicles offer access to the upper portion of the fuel tank via an opening located in the trunk under the trunk mat/carpet or under the back seat. If this is the case removal of the fuel tank is not normally necessary, but you will still be working with the fuel tank. If you are able to do this procedure in the vehicle, keep in mind you will first want to disconnect power to the fuel pump and sending unit. You can disconnect the negative battery cable, but I believe on an the kadette you will need to obtain a special cable from your local auto part supply to maintain power to the ECU or PCM to prevent damage to the computer or loss of programming. At the very least remove the fuel pump relay and disconnect any fuse/relay related to the dash gauges prior to beginning this operation. Also be sure to remove the fuse for any possible ignition source inside your vehicle, such as dome and courtesy lights. Keep cell phones away from the work area as well. If you use a "trouble light" be sure it is marked as safe for use near fuel fumes. Keep doors or windows of the vehicle open to allow vapors to escape so you don't suffer any ill effects and to further reduce ignition hazards. If you must remove the fuel tank, practice good safety. Do not be under the tank at any time. Be sure to remove it with very little fuel in it. Go slowly and be sure you don't break any wires or lines. It is a very involved process and may be best left to a certified mechanic or at least one who is very experienced. Keep me posted and let me know if this helps!

Posted on Feb 01, 2009

volvo2103
  • 122 Answers

SOURCE: Fuel Gauge reads empty, but tank IS full

the float in your gas tank seems to have water in it....water is heavier than gas, that's why gas floats on top of water....try putting something like HEAT in it to dry up the water in your tank....

Posted on Feb 03, 2009

  • 1168 Answers

SOURCE: 2001 chevy silverado 4.8 gas gauge not working properly

Fairly common problem with GM vehicles. The sending unit in your tank has a small circuit board that an arm is attached to which moves up and down according to your fuel level. This circuit board and arm are not making good contact. Unfortunately the only good solution is to replace this part.

Posted on Oct 28, 2009

Testimonial: "thought probably that was it but better off replacing whole unit .i was for for gauge proplem thanks. "

  • 293 Answers

SOURCE: 2007 GMC Envoy - Gas gauge showing empty and check engine light

This is a safety feature that the vehicle brings. You need to reset the E.C.U on dealership or it will keep doing it to you. It was probably caused by one single time that you did not closed the fuel cap correctly. Good luck

Posted on Dec 29, 2009

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1 Answer

Why my gas milage fluctuating on gauge


check the sending unit in the tank when they go bad they will miss read the level. Sometimes the car can be full and the gauge will read only a quarter tank or it might be low and will read 3/4 to full.

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you may have crossed the wires. on the read wire some were but if your pump is in the tank then you have put the wires in the way of the gauge sensor easy thing to do when putting the top back on. just take the top back off and move the wires to the oher side wile holding the top and putting it back on.

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My 84 chevy truck gas gauge only reads quarter when I fill gas tank.


put a test light on the wire from the tank if the gauge goes to full its a bad sending unit in the tank

Jul 17, 2012 | Cars & Trucks

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Gas light stays on and it reads a quarter tank


Dear Sir>
Please see the schematic attached, proceed with logic system for troubleshooting and fix it. Look for loose connection, corrosion, dirty, dust, vibration, burn or break wires, defective relais or pump.
God bless you
5_25_2012_9_30_24_am.jpg5_25_2012_9_30_50_am.jpg5_25_2012_9_31_23_am.jpg

May 24, 2012 | 2000 Kia Sportage

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Is there a relay for the gas gauge on a 1995 ford contour


Normally no. The fuel gauge reads by resistance, the position of the float in the fuel tank, that voltage is directly sent to the gauge. There is also usually a warning light that operates off of this same system but it reports when the float level is extremely low only.

If the gauge isn't working, you may want to inspect the wiring harness at the fuel tank to make sure everything is intact, nothing frayed, pulled loose, or broken under there. If the pump has been replaced, sometimes the fuel float gets into a bind when installed improperly.

Usually the only other thing that has an impact on the fuel gauge is the ground circuit to the dash display.

Good luck !

Mar 30, 2012 | Cars & Trucks

2 Answers

2001 chevy silverado 4.8 gas gauge not working properly


Fairly common problem with GM vehicles. The sending unit in your tank has a small circuit board that an arm is attached to which moves up and down according to your fuel level. This circuit board and arm are not making good contact. Unfortunately the only good solution is to replace this part.

Oct 28, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

I need to know how to rewire my wires going to my gas tank. My fuel gauge doesn't read right. When i fill it up it only goes to a quarter.


most lickly the sender itself is bad this very common on your model truck. does the low fuel light come on even when its full at every stop then read ok once you start moving again?

Jun 03, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Gas gauge flys from quarter tank to way past full mark and sticks


This isn't a definite fix, but it may be that the gasoline in your tank is 'sloshing' forwards and backwards and your sensour is getting readings when the gasoline is in different positions in your tank. The connection is actually above your gasoline tank and you'll have to take off the tank harnesses and drop the tank if you want to check to see if the connection became slightly loose, otherwise you can just fill your gas tank and reset your temporary milage gage (that's the little black button near your RPM meter) and remember how many miles you get per tank.

Jan 27, 2009 | 1989 Chevrolet Beretta

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