jimfed

It seems that my gas gauge is stuck on full. I noticed that after putting a few hundred miles on my car after filling the tank with gas that my gauge hasn't moved at all. I went to the gas station and filled the tank up and it was nearly empty. My car is a 1986 Pace Car with 13K original miles on it. All the other gauges are working properly any help would be greatly appreciated !

antfarmer2

You can take the fuel door off and the bib pull the sender from there and clean or replace. I would try a bumpy road first.

jimfed

Will do thanks !!!

tomcamaro97

Agree with the bumpy road.. But, the way it works is there's a float in your tank.. The higher the float the more voltage gets back to your gauge. It's prob suck up.. So If the road doesn't work, open it up and move it. Once it's moving if voltage is changing them is working, if but you need a new sending unit.. Believe it's the pink wire

jimfed

Thanks Tom !

gerardvg

Hi

If it doesn't free up have a close look at the gas tank, I had my tank suck inwards jamming against the float.

You really need a almost empty tank so you can remove the sender assembly, feel inside the tank for any collapsed areas.

I straightened my tank and replaced the gas cap and has not re occurred. Just another thing to look at ....

antfarmer2

13k most likely has the original cap and just sat to long and got stuck.

WW7

Just be glad you have a C4 , most other cars aren't as easy to gain access to the sender or pump......WW

jimfed

Gas tank is in new original condition, have the car on the lift and felt all around and found no damage at all.

70ZZ3 96LT4

My 1996 LT4 gas gauge was not working right, I did not do anything except make sure I did not run out of gas. It corrected on it's own and no other problems last year.

tomcamaro97

jim,

just go into the tank ..itll literally take you like 10 mins... its the 4 torqx bolts by your gas filler. then the hose clamps and 8 bolts that hold the whole sending unit in place.. its super easy...

yank the whole thing and check the sending unit.. thats where ide start. and the most likely cause...

this setup has been the same for like 50 years because its super simple, and works.

lovmy90vette

Can the sending unit be accessed under the gas cap on a 1990 coupe?

antfarmer2

All C4s

JWMorrisey

I just developed the same problem on my '86 coupe.


Filled the tank and the gauge hasn't dropped since. I'm less than an hour from KEEN Parts so I 'll pull the sending unit and run over there to pick one up if needed.

lovmy90vette

My gas gauge has been on full for the past 2-3 years. I use the trip mileage option and when I get to 400 miles I know the tank is low. I have had enough of this so I think I will buy an new sending unit from RockAuto and replace the old one. Anything I need to know about this repair??

billschroeder5842

I'd agree with Tom. Do it right and you will have the peace of mind. Even if a bumpy road (I'd freak about creating additional rattles in my car) jars it loose it will just get stuck again.

Popping it out will also allow you to move the float up and down testing the gauge on your dash.

This is a two beer job.

jimfed

Thanks Bill, I will be doing it soon, just been tied up on my truck project. I will be buying a new sending unit and fuel pump, easy fix !