Convertible65

So my fuel tank started leaking around the sending unit. Called my father-in-law and he sent over an extra one that he had in storage. O-ring looked to be in above average to great condition. Took out the old and cleaned all areas back to metal. Installed the sending unit and the o-ring. The darn thing is still leaking. Tried 3 times and all three times it leaked.

Is there some kind of trick or am I missing something???

Thanks.

6T7L71CPE

Is the seal leaking or the terminals on the sending unit? Is it a bad REPRO as discussed here: REPRO

67vetteal

Soak the Oring in motor oil overnight before installation. (JohnZ).
Al W.

al329

When I changed out my tank and sender I found that the tank o ring was larger than the one that came with the sender. I used the larger one to obtain a tighter fit. Might try a replacment o ring if the oil soak dosent work. Could end up with a larger one?!?

Good luck.

mrruffhouser

You did say if the gasket was cork or rubber. I like the cork ones better and you might try spreading some gasket sealer on both sides of the gasket when installing.
Also check earlier posts on this problem. Good luck.

dkjfdx

I bought a new one that leaked. Thought it was the o-ring - it wasn't. One of the terminal solders was bad and it leaked around the terminals.

JohnZ

No cork gasket for the sending unit - they all used a fat rubber O-ring between the sending unit flange and the tank flange.

wombvette

I have never had much luck with an old O-ring. Use a new one.

Convertible65

Thanks for the responses gentlemen. I going to pick up a new O ring. Should I still soak the new one in motor oil?

Thanks,

Roger

JohnZ

It was an Engineering requirement in the plant to soak it for two hours; they must have had a reason or they wouldn't have specified it.

Powershift

John:

Speaking as an engineer myself, not every engineering request or requirement had a good reason.

Maybe this one did, though.

Larry