88 firebird 305.. My fuel gauge is stuck on f. Replaced the gauge and the new one stays on full. My mechanic friend said that it cant be the sender because my gauge doesnt go to e when i turn the car off.. Is this true? How do i check for a broken ground? Etc any and all advice would be very helpful. Thank you

 

When the sender ground is disconnected (behind the back seat), then the gauge will read full all the time.
You can normally just give the wire a good ground and look at your gauge to see if it works for a test. It is a common thing to just go bad from age for some reason. I had one do this. Regrounded the wire and all better since.

 

Thanks. Il check that either today or tomorrow and see what happends.. Are you talking about the section literally behind the back seat. Or the section under the car where the back seat is

 

I had to pull the seat and carpet up to get to mine.

 

Which one is the ground?

 

The wire that attaches to the body of the car.

 

And thats on the outside of the car right. I have 3 colored wires that lead to outside. When i wiggle them i get no change to the gauge. Which im assuming is expected.

 

My friend said that if i werevto probe the ground with a test light then the gauge would wiggle a bit , when i did nothing happened.... Im thinking its gatta be the sender.. Damn thing is 200 bux!

 

My ground connected to the body on the inside of the car behind the passenger-side rear seat.

I would probe all the wires with a DVM to make sure the sender is getting signal.
It might end up being something loose behind the dash.