Fuel Sending Unit

[cfmustang]

Right before I put the car away for the winter, the gas gauge stopped working. I fiddled a bit under the car at the sender and under the hood and it started working for a few minutes and then stopped again.

Hasn't worked since. A month or so ago I checked that dashpod and both wires were on and seemed tight enough. Wiggleing them didn't seem to make any difference.

I am thinking that it is the sending unit in the tank, but am not sure. Anyone have a idea on how to determine if it is the sender, wire or guage?

If it is the sending unit, how difficult are they to replace? Is it possible to just drain the tank and do it while it is still in the car, or does the tank have to be removed?

Chris

 

[wsa111]

Chris, if i remember pull off the wire at the sender, see what your guage reads. Then ground the wire. The dash guage should respond with the opposite reading on the dash guage. If no changes go to the dash guage & perform the same test, if still no change replace the guage, if the first test makes a change replace the tank unit. William

 

[Anonymous]

Replacing it isn't hard, if you have a tank with a drain plug. Just remove the drain plug, undo the ring that holds the unit in place and pull it out.
That should be it if I remember correctly

Good Luck!!!

 

[65coupei6]

Remove the wire from the sender and ground it. If the gauge pegs then it is probably the sender. The floats corrode and holes form , filling them with gas and the senders don't read anymore.

I would buy a sender from K.A.R. Mustang. They are more expensive but are better quality and have the right ohms.

ALSO USE A BRASS PUNCH or RUBBER MALLET to remove the metal ring. You don't want any sparks while removing the sender. And make sure the tank is drained good. Gas in your eyes or mouth is not fun.

 

[cfmustang]

Thanks for the tips on checking the gauge!

As for the problem with sparks and fumes, I think I'll just probably replace the tank and sender together. I don't have any holes currently, but that tank is going on 40 years old. It is probably full of rust and gunk and can't have too many years left in it.

If I have to pull the tank anyways, it is no more work to replace it with a new unit than putting the old one back in. In fact, it is probably less work because I don't have to go through the trouble of pulling the old unit (probably rusted to the tank) out.

-Chris

 

[BIGREDRASA]

New is good, as long as the Mustang's old!