Fuel pipe thread sealant fumes in my garage.

[Ricosan]

I’ve finally located the the source of the gas fumes that I’ve been chasing for over a year. With the help of a friend, I was able to uncover the gas tank in my ‘33 Woodie.
I discovered that the leak was where the fuel goes into the gas tank from the outside. The two sections are screwed together at the fuel tank. They look to be about 2” inches in diameter and sealed with an unknown substance.
I am planning on unscrewing this section and reinstalling with a sealant on the threads that will not deteriorate or become brittle.
What product would you recommend?
Richard

[Lawson Cox]

The two sections are screwed together with a lead washer in between. 3rdGen Auto parts will have that lead seal. I had to use two of them on my PU. Don't use pipe sealant.

[V8COOPMAN]

Originally Posted by Ricosan

I’ve finally located the the source of the gas fumes that I’ve been chasing for over a year. With the help of a friend, I was able to uncover the gas tank in my ‘33 Woodie.
I discovered that the leak was where the fuel goes into the gas tank from the outside. The two sections are screwed together at the fuel tank. They look to be about 2” inches in diameter and sealed with an unknown substance.
I am planning on unscrewing this section and reinstalling with a sealant on the threads that will not deteriorate or become brittle.
What product would you recommend?
Richard

Richard.... These are the only two products that I could find that mention "GASOLINE" specifically, rather than "diesel" or some other form of "fuel". Looks like you can order it from either "Amazon" OR the "GASOILA" site in the links BELOW.

NOTE: The stuff in the WHITE can is $23.45 for 1/4 PINT can from the manufacturer.... NOT the $85 that Amazon shows.

https://www.amazon.com/Gasoila-Soft-...51&sr=8-4&th=1

https://www.amazon.com/dp/B001VXXZUW/ref=emc_b_5_i?th=1


https://www.jmesales.com/gasoila-pls...ontent=Gasoila

[34fordy]

Originally Posted by Lawson Cox

The two sections are screwed together with a lead washer in between. 3rdGen Auto parts will have that lead seal. I had to use two of them on my PU. Don't use pipe sealant.

The threads are not pipe threads so pipe sealant is not the answer. IMHO
The threads you see turn and butt up against a flange on the filler neck. The lead seal fits inside the tank opening and as you tighten the threaded portion of the filler neck against this flange the lead seal is compressed and the seal is made. I would suspect that there is an old lead seal in your tank opening that needs to be removed. A thorough cleaning of the male and female threads in the tank is very important. I believe if you do this only one lead seal should be required. (With apologies to Lawson) I did this job on my pickup last month.

[tobby]

probably isn't applicable to your problem, i use a product named fuel lube, once you use it you will use nothing else, it's available from aircraft spruce in southern california. buy it on line from them, comes in a tube........

[ford38v8]

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From your pictures, teflon tape had been used, wrong on so many levels. Lawson advised 3rd Gen as a source for the correct lead seal. No sealant required.

[Ricosan]

Thanks guys. Ordered the lead washer from 3rd gen. Will check locally for the thread sealer.
Richard

[rich b]

Once you take it apart to install the lead washer; you will see why there is no need for thread sealer as the threads seal nothing.

I would inspect the fill tube itself in the area covered by the sleeve as it not uncommon for rust pinholes to happen there. Sometimes hard to see as the sleeve can not be slid back up the tube all that far.