Question about GMC Sierra 1500

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The fuel guage reads three quarters full when its around a quarter full..sometimes half full..its just erratic

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Sounds as if the float has seperated from the sending unit. It will need to be pulled from the tank to be checked and/or repaired.

Posted on Sep 28, 2010

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The petrol gauge, from empty to quarter how much litres is it? And from quorter to half? From half to three quarter? Lastly from three quarter to full?


how would we even begin to guess at this . having no idea as to a make model year etc,etc . try calling a local dealer .

Jul 16, 2016 | Cars & Trucks

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Fuel gauge is not reading properly 2006 Mercury Mountaineer


Fuel gauges are not meant to be precision instruments. You might want to fill up a 2 gallon can and drive the car until it runs out of fuel to see how low the gauge will go before it's really empty. Use the 2 gallons to get back to a filling station.
I once spent three working days trying to get a 1972 Chrysler to read full when it's full, half when it's half and quarter tank when the tank has a quarter amount of fuel. The customer did not want to accept anything else, but in the end all I did was to get close, not exact.
It is possible that the fuel float in the gas tank is "drowned", that is, the plastic float might have a slow leak and some fuel found its way inside. This will cause the float to submerge slightly and give you a low reading. To check this you will have to remove the float unit from the tank.
In any case, if you feel up the job (not easy) remove the float unit from the tank and manually move it up and down while checking the meter reading. You can bend the wire holding the float to correct misreadings.
Personally, I wouldn't bother, just be aware that when the reading is low, feel safe that you still have enough fuel to get to the next filling station.

Apr 04, 2014 | 2006 Mercury Mountaineer

1 Answer

Acts like it is running out of fuel at quarter tank on guage


pickup in tank sounds like it has a hole in it halfway down

Oct 12, 2012 | 1996 Chevrolet Blazer

2 Answers

Gas gauge and tach do not read proper readings! What will cause this? The gas guage will peg past full when there is only quarter tank and tach reads 4500 RPM at idle


The gas tank sounds like a bad ground usually located under the car at the gas tank. I do not know but maybe they both tach and fuel gague get their ground from the same place.

Dec 26, 2010 | 2004 Chevrolet Monte Carlo

1 Answer

My temp gauge reads only a quarter hot.when i tow a trailer or use my air my temp goes past half and my engine light comes on.


I would supect you actually have two problems going on here. First off it sounds like your guage is reading inaccuratly. When it is reading at one quarter it probably should be at the half way point. This is the normal operating range. The most likely cause is the temp sensor for the guage. When you pull a trailer and engine gets under a load the tempature sounds like its going up too high. Your engine light comes on because it uses a different sensor and is registering accurate tempature. I would start by comparing actual tempature of engine with what the guage reads, this can be done with a scanner or a heat gun pointed at the thermostat housing. I believe you will find a faulty sensor or possibly an outside chance of a bad guage.(but doubt it!)Once that is straightned out you will have to look at why is the engine getting too warm under load. I would start with radiator flow,A ristricted radiator either internally or externally will cause this. Good luck!

Mar 13, 2010 | 2001 GMC Jimmy

1 Answer

Fuel Guage registering improperly!


remove float assembly and reposition it facing the oposite direction. Sometimes the float installation positioning makes a difference on how the fuel gage reads.

Feb 25, 2009 | 1995 Chevrolet S-10 CA Edition

1 Answer

Fuel gauge


there is little else that causes this except the fuel guage sending unit in the gas tank.

Jan 12, 2009 | 2002 Mini Cooper

1 Answer

Fuel guage reads half way and the truck runs out of gas


The float that helps detect fuel level is most likely broken. You or a mechanic will have to remove the fuel pump from the gas tank and check and possibly replace the float. Merry Christmas.

Dec 23, 2008 | 2001 Chevrolet S-10

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