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Gas Cap Seal

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JohnnyMead

JohnnyMead

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The gas cap assembly on my TR3A has a very hard, brittle material that must be what's left of a seal that the cap pushes down on. I can't find it listed as a part for sale. Has anyone replaced it?
Thanks,
John
 
The seal on my TR3 cap (which is new) is also a hard material. It is thin and just sits inside a recess. It appears to be some sort of fiber. In the upper part of the cap, there is a spring loaded section that is able to move axially in all directions so it can mate with the gasket you are talking about.
 
John - this sure doesn't constitute an expert recommendation ... but I made my own seal by cutting some inner tube into the proper shape. Had to do some trimming, but it's worked well for 3 years.

Just my 2¢.
Tom
 
Your local Pep Boys/Autozone/Advance/etc. all have rolls of different gasket materials. I've used the rubber/cork and the dark grey stuff that looks like roofing felt with good results. They come in varying thicknesses as well, so you should be able to find something suitable.

Mickey
 
NutmegCT said:
John - this sure doesn't constitute an expert recommendation ... but I made my own seal by cutting some inner tube into the proper shape. Had to do some trimming, but it's worked well for 3 years.

Just my 2¢.
Tom
Click to expand...

Tom, you may want to change that gasket to one made of a different material.

I have experimented with this.

I once made a gasket from an inner tube to use on the gascolator on our engine test stand. The gasket swelled to five times its original dimensions and fuel went everywhere!
 
Thanks for the suggestions.
I started to look at that seal after I sprayed a lot of water around the gas cap when I was washing a summer's worth of crud off the car. The next time I went for a drive the car started to act like it was running on water. I've tried to eliminate any other possibility.
 
Twosheds said:
Tom, you may want to change that gasket to one made of a different material.

I have experimented with this.

I once made a gasket from an inner tube to use on the gascolator on our engine test stand. The gasket swelled to five times its original dimensions and fuel went everywhere!
Click to expand...

Yikes - haven't experienced that, and sure don't want to. Thanks John for the heads-up. What material would you recommend for Johnny Mead's gas cap?

By the way, how's life in your neck of the woods?

Tom
 
Go by a roofing contractors shop and ask for a scrap of 45 mill EPDM. Gasoline doesn't have any effect on it, easy to cut and shape, will last forever.
 
I had the same problem finding one. Mine really looks like cork so I will replace with cork gasket material. What adhesive to use?
 
NutmegCT said:
Thanks John for the heads-up. What material would you recommend for Johnny Mead's gas cap?

By the way, how's life in your neck of the woods?

Tom
Click to expand...

I don't know about the material compatible with gasoline, but others have answered.

They are calling for frost on the pumpkin tonight here and my furnace is kaput. I'm using the woodstove, but I'm a little nervous what with breathing this 100 per cent oxygen while messing with the fire!
 
Wht's up with the O2, John? I must have missed something...

Mickey
 
Mickey Richaud said:
Wht's up with the O2, John? I must have missed something...

Mickey
Click to expand...

COPD, Mickey. I have been needing to use it for a few years now, but I'm contrary, not to say hard-headed. Last year I gave in and use it all the time now. It's a pain to deal with, but...
 
Sorry, didn't know.

Understand completely about being contrary. But do what you gotta do...

Mickey
 
Sorry to hear that, John.

The cap assembly doesn't seal all that tightly anyway; mine has a vent hole in the inner cap, and would leak somewhat at the stem between inner and outer anyway. Since ISTR the seal lays down in a groove, O-ring cord should work fine; or you could probably just fill the groove with RTV (letting it set firmly before closing the cap, of course).
 
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