Gas gauge

[99bonnySe]

my gas gauge always reads full and idk waht the problem is, when i turn the key to "on" it seems to be in the postion of how much has i have in it then it spikes to full when i start the car. also sometimes the gauge just goes to empty and i get a light "check gauges" any help would be appreciated

[LeSabre in Buffalo]

The sender is inaccurate, or there's a wiring problem somewhere. For the sender, you can get 2 cans of Chevron Techron Concentrate and add that to a full tank of gas. Then let the car sit for a weekend, and drive it to work and back. If the sender is fouled, that will clean up the sender. Otherwise, you'll have to replace the sender assembly. That's a PITA since the tank needs to be dropped.

[99bonnySe]

*dang* alright ill try that cause its hard to tell how much gas i have, that would be the sending unit that has to be replaced right?

[Bob Dillon]

*dang* alright ill try that cause its hard to tell how much gas i have, that would be the sending unit that has to be replaced right?

Yup, sending unit. I used the cheap one from Rockauto, it was like $75 (versus >$300 for the factory part) and replaced it myself in about 3 hours. Two guys makes it a whole lot easier. A lift makes it easier still, but who has a lift?

If you decide to do it, buy the tank gasket with three prongs sticking downward from the dealer, maybe$10. I never could get the plain o-ring provided with the sending unit to seal.