Question about 2003 GMC Envoy
WITH TRUCK RUNNING GAS GAUGE IS ON EMPTY AND LOW FUEL LIGHT STAYS ON
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Posted on Jan 02, 2017
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
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.
Posted on Mar 13, 2009
SOURCE: fuel gauge inop on 2005 envoy
Hi, this is a sending unit issue. you can try adding some Sea Foam additive to the tank. this may release the sender. if the additive doesn't work, replace the fuel level sending unit.
Posted on Jun 22, 2009
if the fuel pump is all in-tank; the sending unit built in to the fuel pump is most likely malfunctioning; if so, this will require removal and replacement of the entire fuel pump, sometimes expensive, others not so much
Posted on Oct 06, 2009
Testimonial: "thank you very much for the help"
You will need to replace the fuel level sensor which is in the fuel tank.They have a lot of problems because the metal fingers on the sensor wear off and gives you the incorrect readings.This will also cause the check engine light to come on.You will probably have a level sensor code.This will be a lot easier if the fuel level is down to about a quarter tank or less.Also you should be able to get just the level sensor and not have to get the complete fuel pump module.Good luck.
Posted on Dec 02, 2009
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