Question about 2006 GMC Envoy

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When it full it read empty and light come on only when fiil to top

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Sounds to me like faulty tank sendor unit and/or connections to it

Posted on Feb 15, 2012

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Posted on Jan 02, 2017

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1 Answer

Fuel gauge not working


You will need to test a number of things, the fuel gauge is part of a rather simple circuit.

Battery -> gauge -> tank sensor -> chassis ground to battery

If the circuit is broken at any of the steps, your gauge will read "empty". If the tank sensor is bad, it could read empty, or if the float in the tank has sunk, it will read empty.

I start at the gauge with a "test light" that glows when it sees battery voltage. Get a light at the connection to the gauge? Good. find the sensor connection, usually on top of the tank, accessible in the trunk. Probe with test light. Light on? Good. Connect wire to ground, gauge should read "full". If all that is as I said, then the tank sensor is bad. If you don't read battery at any step, you know where the problem is.

Nov 13, 2015 | Cars & Trucks

1 Answer

Fuel light is on gas reads empty but full tank


faulty fuel sender unit, usually replacable from top of fual tank under a panel in the floor

Sep 28, 2014 | Cars & Trucks

3 Answers

Hey, all I have a 1999 mercury courger v-6 and the gas gauge in stuck on empty Lights on and cant figure out how to fix! Please help!!! Thanks Matt


Fuel sending unit . Most likely bad. It is in the fuel tank probably requires you to drop the fuel tank to get to it.

Jun 27, 2014 | Cars & Trucks

1 Answer

My fuel gauge floats from full to empty when I stop at a light! And its stays on empty until I drive for about five minute why is that? I can't get an accurate fuel reading!!


I have the same vehicle and my car actually was full of gas, registered empty & left me on the side of the road..It was the sensor in the fuel line that had to be replaced.

Feb 03, 2012 | 2003 Buick Rendezvous

1 Answer

I have a 2004 pontiac montana. for about two years the fuel guage would fold over and read 125 degrees when the tank is full. it woulld stay there until tank was empty and the needle would drop to empty,...


It could be a bad fuel gauge in the dash unit, but....
Usually it's "The bad".
The fuel level sending wipe arm and windings on the fuel sender wear and send erratic readings.The only cure is a replacement fuel gauge sender.
The check engine light should not be related to the erratic fuel readings.
"The good".
If you have over 200,000kms or 120,000 miles on your van you need a new fuel pump anyway,so have a complete assembly put in which will have a new fuel sender on it.

May 21, 2017 | 2004 Pontiac Montana

2 Answers

Gas gauge goes to empty and then full after fillup


very well sounds like the sending unit in the tank. Try running some octane booster and fuel injection cleaner in tank of the truck to loosen any deposits on the float.

May 27, 2010 | 2007 Nissan Pathfinder Off Road

1 Answer

The fuel light on my 99 navigator is mis reading


the fuel level sensor in the fuel tank is faulty the tank will have to removed to access it

Jan 21, 2010 | 1999 Lincoln Navigator

1 Answer

1989 Saab 900 low level fuel light


You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!

Saabreur

Jul 10, 2008 | 1989 Saab 900 4 Door

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