Why a gas leak now?

[Harry S.]

Just put 20 gallons in the tank to store the car for the winter. I start it every two weeks to cycle the R12.

I smelled gas, so today I pulled the tire tub.. It's leaking from the sending unit gasket!

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[Joe L.]

Re: Why a gas leak now?

Just put 20 gallons in the tank to store the car for the winter. I start it every two weeks to cycle the R12.

I smelled gas, so today I pulled the tire tub.. It's leaking from the sending unit gasket!

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Harry------


Did you use an NOS GM gasket or a current "reproduction"? Some, if not all, of the current gaskets have a slightly smaller cross section and, apparently, have been found to be problematic as far as sealing goes.

By the way, I THINK the reason that the reproduction gaskets have a slightly smaller cross section is that this was done to address the difficulty installing the cam lock with the original gasket. If so, they succeeded in accomplishing that but.......

[Don H.]

Re: Why a gas leak now?

Why now?
Because you probably have 100 other things you need to be doing right now, and there is no better time than right after you have filled the tank.

[Harry S.]

Re: Why a gas leak now?

Harry------


Did you use an NOS GM gasket or a current "reproduction"? Some, if not all, of the current gaskets have a slightly smaller cross section and, apparently, have been found to be problematic as far as sealing goes.

By the way, I THINK the reason that the reproduction gaskets have a slightly smaller cross section is that this was done to address the difficulty installing the cam lock with the original gasket. If so, they succeeded in accomplishing that but.......

Joe, what is there was in the car when I bought the car 11 years ago. All will be replaced with an NOS gasket and lock ring.

Thanks

[Tony R.]

Re: Why a gas leak now?

Why now?
Because you probably have 100 other things you need to be doing right now, and there is no better time than right after you have filled the tank.

EXACTLY what I was thinking.

[James W.]

Re: Why a gas leak now?

Last year I bought a sending unit gasket for my '65 from Doc Rebuild before he went off the deep end. What I received was definitely larger in diameter than the repro from then LIC. It fit fine using the two hour oil pre-soak per the AIM, installing it with a new NOS cam locking ring and the cam lock tool I bought from LIC.

James

[Harry S.]

Re: Why a gas leak now?

Last year I bought a sending unit gasket for my '65 from Doc Rebuild before he went off the deep end. What I received was definitely larger in diameter than the repro from then LIC. It fit fine using the two hour oil pre-soak per the AIM, installing it with a new NOS cam locking ring and the cam lock tool I bought from LIC.

James

Dr. Rebuild is now out of stock on those.

[Michael H.]

Re: Why a gas leak now?

Like Don said you need more things on your plate heading into Winter..........

Mike

[Harry S.]

Re: Why a gas leak now?

Just took some measurements on the gasket

NOS Thick .2385 ID 1.868 OD 2.377

Rerpro Thick .2270 ID 1.789 OD 2.277

[Jimmy G.]

Re: Why a gas leak now?

Murphy's Law 122 It always happens at the worst possible time

[Patrick H.]

Re: Why a gas leak now?

I just installed one in the 63 with a gasket obtained from Paragon.
It was definitely thick, and took some effort to install. So, whoever supplies theirs likely has the sizing correct.

[John P.]

Re: Why a gas leak now?

Hello Harry, disconnect the two wire connectors from the posts and see if the posts have nuts or are riveted. If you have the original threaded studs with nuts, check if the nuts are loose. I just had the same issue with my 1966. Tightened the nuts and problem solved.

[Harry S.]

Re: Why a gas leak now?

Hello Harry, disconnect the two wire connectors from the posts and see if the posts have nuts or are riveted. If you have the original threaded studs with nuts, check if the nuts are loose. I just had the same issue with my 1966. Tightened the nuts and problem solved.

Good suggestion, first thing tomorrow.

[Harry S.]

Re: Why a gas leak now?

I just installed one in the 63 with a gasket obtained from Paragon.
It was definitely thick, and took some effort to install. So, whoever supplies theirs likely has the sizing correct.

Patrick, you have their part number, this is what I found and it's not correct.... https://www.paragoncorvette.com/prod...ng-unit-gasket

[Gary B.]

Re: Why a gas leak now?

Paragon 3861

https://www.paragoncorvette.com/prod...it-o-ring-seal