Fuel gauge issue - Sender? 1965 coronet

[dubber91]

Hi Everyone,

Ive searched and can see that fuel gauges are a bit of an achilles heal for these cars.

That said I have a 65 coronet that has a weird issue. Grounding the sender wire and the gauge swings right the way over and heads to full. That seems to check out the cabling, voltage regulator and gauge.

Putting a meter on the gauge it seems to sweep from c. 9ohms to c. 72ohms.

But earthing the sender and connecting the sender to the terminal, moving the float doesnt seem to have any effect.

Has anyone dismantled the sender and worker out how it works? If there some way this could be an partial failure of the voltage regulator?

Regards

Steve

 

[pnora]

Sounds like the sender,s rheostat is open. Have you tries ohm-ing the sender itself?

 

[dubber91]

yes i used the ohm meter from the sender terminal to the sender metalwork.

 

[Lefty71]

Gas tank grounding strap missing? Or possibly other body ground strap??

 

[dubber91]

YEah i guessed that but it seems to be an issuewith the sender. Despite measuring the resistance accross the terminals and seeing it swing, the gauge isnt reading anywhere near ful with the sender in or out of the tank and earthed.

 

[Sinitro]

Sounds like the sender,s rheostat is open. Have you tries ohm-ing the sender itself?

User advised the rheostat sweeps from 9 Ohms to 72 Ohms, so the rheostat itself is fine and working, not open..
I would suggest that he check the grounds and end connections of the rheostat/sending unit..

Just my $0.02..

 

[pnora]

User advised the rheostat sweeps from 9 Ohms to 72 Ohms, so the rheostat itself is fine and working, not open..
I would suggest that he check the grounds and end connections of the rheostat/sending unit..

Just my $0.02..

In his first post he did not say rheostat he said gauge thats why I said bad sender. .

 

[jimbosride]

Here my 2 cents

When putting the new tank and sender in I did not use the gas outlet ground strap. I did a direct wire ground from sender to body.