Fuel gauge my 1997 GMC Sierra gas gauge reads full when it is running. then when i shut the truck off then i guess it wants to read it right and im not really sure if i should go off that or not. when i got the truck i put $55 in it and at the time the gauge showed under a half and i drove a 111 miles and not when i shut the truck off it shows that i have a little under a half a tank and a little under 1/4 so should i go with shutting the truck off to see how much gas i have left?

SOURCE: Fuel Gauge Not Reading

you might wanna check the contact on the floater i had that problem so i just bent the contacts closer and that worked for me

SOURCE: fuel gauge stuck on half full

I can tell you almost for certain your fuel level sending unit is bad, I have been able to fix them though. It requires removing the gas tank and then the fuel pump. You can if your inclined, bend the brushes on the small circuit board over more so they will make better contact on to it. Other wise its a new fuel pump assembly, check all plugs and wiring by unpluging and repluging them to insure no bad connect. It is possible it could be the guage itself, but in thirty years of fixing cars never had a bad guage

SOURCE: The fuel gauge doesn't read right, makin' low fuel light flash

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

Testimonial: "thank you very much for the help"

SOURCE: 93 gmc sierra 5.7 liter engine, injection carb,

you say you replaced the fuse, but does the fuse have power? the gray wire at pump should have power when cranking, or for 2 seconds when turning key on. At fuel pump relay, put power onto gray wire, the pump should run if the wiring is good. if it doenst run then ck for power at fuse while power is on gray wire.

SOURCE: GMC envoy after I filled gas tank the low fuel

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.