Turn key on do not start wait 10 sec then push down on brake and gas pedle for 10 sec done
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SOURCE: gmc Envoy with erratic fuel gauge.
I have found that just about 100% of the time this condition is caused by a defective fuel gauge sending unit in the gas tank.
SOURCE: gas gauge on 2006 gmc envoy says empty after fill up
this is a giant comon problem right now with gm vechiles it is in the fuel sending unit the unit needs to be replaced ( about 400$) and the gas tank needs to be dropped out to get to it for many more people with the same proble go to topix.com there is about 96 of us with the same problem
SOURCE: how do i change the fuel filter in a 2006 Subaru
Fuel filter is built into the fuel pump assembly.
SOURCE: 2003 GMC Yukon - fuel pump
Check your ECM fuse. There should be 2 fuses for your ECM. It's the ECM that controls the function of the fuel pump. Good luck friend and it's also common for the wire harness from the frame to the fuel pump to go bad due to corrosion from the bad weather we get in the winter and rainy spring and fall.
SOURCE: 2002 Chevy Silverado 3500 Fuel gauge reads 1/2
If this was not a problem before the pump replacement then the sender in the tank may of faied or is contaminated with sulfer which is corrosive to the silver electrical contacts.
Do a search on sulfur corrosion and fuel sender units. Gm has big problem with this. Its possable the stress from removing the old and installing the new pump created an issue with contacts. If this is the case you will now need a sender unit.
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