Fuel gauge problems

[JohnR]

Hi, my fuel gauge on my 74 Plymouth Satellite shows empty, I traced the wire back from the tank and at the connection that sits behind the kick panel I put a test light on it and the gauge works ( shows half tank) but the test light pulses any ideas on what the problem is, thanks.

 

[wahya]

I think the oem voltage limiter is supposed to pulsate. I would check the ground at the tank.

http://www.forbbodiesonly.com/moparforum/threads/gas-tank-ground.57399/#post-909928565

 

[Fran Blacker]

Did you ground the wire that goes to sending unit? When you ground it the gauge should read full.

 

[mopar 3 B]

Do not ground the sending unit wire directly.

 

[Dibbons]

I just took the pickup out of my 72 because the gauge was working fine, then read empty all the time. I found the brass float had a tiny hole and it filled with fuel and therefore would sink instead of float. Replaced it and works fine now.

 

[wahya]

Come to think of it, you didn't say if there was any gas in the tank.

 

[Fran Blacker]

Do not ground the sending unit wire directly.

Curious why not

 

[mopar 3 B]

Curious why not

The gauge needs to function between 73.0 ohms empty plus or minus 12 ohms and 9.6 ohms full plus or minus 1 ohm.
A direct ground exceeds the spec for the gauge when full and will only prove the gauge can be pegged not that it works correctly.

 

[JohnR]

Thanks guys will go back to the tank and check the ground first and go from there, and sorry yes it has gas in it.

 

[multimopes]

Hi John,
How did you make out with your fuel gauge?