walkthelin3

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

305sbc

iTrader: (3)

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.

walkthelin3

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

305sbc

iTrader: (3)

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

walkthelin3

Which one is the ground?

305sbc

iTrader: (3)

The wire that attaches to the body of the car.

walkthelin3

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.

walkthelin3

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!

305sbc

iTrader: (3)

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.