Fuel tanks gaskets

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grimreaper

grimreaper

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Who knows of a source for fuel tank sender gaskets that last? I have replaced the senders (which don't work correctly either) in two of my cars and those gaskets lasted a couple of months. The replacement gaskets from sources like classic, year one, E-bay etc. leak gas onto my garage floor every spring when I move the cars after sitting for a while. The gaskets just go bad sitting there. They just get really soft and slimey. I have scrounged up a couple of old used heavy gauge lock rings so they are good but the gaskets continue to fail. Recommendations??
 
Detroit Muscle. If you still have the original lock ring use it. The new lock rings are about half the thickness they should be. The new sender units will never read correctly. They are build incorrectly. If you have the original unit you can send it out and have it rebuilt. There are a few threads on here about the sending unit problems so just do a search. Or put up a wanted ad, that is how I got mine fixed. When I park my cars for the winter I never have them over 1/4 tank so the fuel isn't setting on the sending unit rubber. It's worked out fine for me for over 10 years or so.
 
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I made my own out of about 1/8" cork gasket material with a thin film of proper rtv on both sides. Let it tack up good and assemble, no leaky for decades.
 
Have you checked with the dealer? Maybe still an available item.....at least it was a few years ago when I got mine.
 
I ended up using the supplied o ring with used o ring also. It was tough to get on but has not leaked
 
grimreaper said:
Who knows of a source for fuel tank sender gaskets that last? I have replaced the senders (which don't work correctly either) in two of my cars and those gaskets lasted a couple of months. The replacement gaskets from sources like classic, year one, E-bay etc. leak gas onto my garage floor every spring when I move the cars after sitting for a while. The gaskets just go bad sitting there. They just get really soft and slimey. I have scrounged up a couple of old used heavy gauge lock rings so they are good but the gaskets continue to fail. Recommendations??
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I just replaced my sender with a working factory unit and had the same exact experience. I bought my gasket from Vans,and it was installed for about 3 weeks or while I soldered the sender and when I reinstalled it the new gasket was swollen and distorted due to the ethanol in our crappy gasoline. Dupont Viton rubber is supposed to be ethanol resistant but I dont know who makes one out of that material for our cars. And yes I used the factory locking ring. So far the car hasn't leaked gas,but I haven't put more than 5 gallons in it yet.
 
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mopar head said:
I made my own out of about 1/8" cork gasket material with a thin film of proper rtv on both sides. Let it tack up good and assemble, no leaky for decades.
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Perfect imho. Viton orings that would fit and viton sheet big enough to cut are crazy expensive. I was thinking he might be running e85 in Wyoming. If it were just the lock ring, it would leak immediately.
 
MV8 said:
Perfect imho. Viton orings that would fit and viton sheet big enough to cut are crazy expensive. I was thinking he might be running e85 in Wyoming. If it were just the lock ring, it would leak immediately.
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Yeah,fuel line made from the stuff is about $15 a ft out here. If only we could get the idiots to just take the ethanol OUT of gasoline to begin with. It's been proven that it has no benefits only detrimental effects. First it doesn't combust as efficiently leading to reduced milage,it has a tendency to ping,destorys rubber,and is hygroscopic,undergoes phase separation. Whoever started it should be drawn and quartered.
 
MV8 said:
Perfect imho. Viton orings that would fit and viton sheet big enough to cut are crazy expensive. I was thinking he might be running e85 in Wyoming. If it were just the lock ring, it would leak immediately.
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Only 10% ethanol in regular gasoline here in Wyoming. I'm not so sure the ethanol is the issue. The new replacement gaskets look to be made of some sort of flexible shiny plastic that is obviously not fuel resistant.
 
cudamark said:
Have you checked with the dealer? Maybe still an available item.....at least it was a few years ago when I got mine.
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The parts guys at the local dealer can't (or don't want to) look anything old up on their computers. I might try some of the places that have NOS parts though..... those seemed to last 50 or so years.......
 
If you were using ethanol, expanded teflon is another option that isn't crazy expensive for a 3x3x1/8" piece and is soft enough to use as a gasket. Local parts store should have gasket material in rolls but usually not that thick. I've bought 1/4" thick scraps of cork sheet on ebay for projects.

Check that the tank vent is not plugged.
 
1968 Dart 270 said:
I bought my gasket from Vans,and it was installed for about 3 weeks (…) when I reinstalled it the new gasket was swollen and distorted due to the ethanol in our crappy gasoline.
Click to expand...

No, it was because Vans' crappy Chinese vendor sent a BRK gasket (black round kind) instead of one made out of a material with appropriate chemical resistance, like Viton-F or Buna-N/Nitrile.

We're not talking about a complex-shape gasket here. It's a circle! A place like this or this might very well have the right size on shelf, or if not, it'll probably be cheap to get 'em.
 
slantsixdan said:
No, it was because Vans' crappy Chinese vendor sent a BRK gasket (black round kind) instead of one made out of a material with appropriate chemical resistance, like Viton-F or Buna-N/Nitrile.

We're not talking about a complex-shape gasket here. It's a circle! A place like this or this might very well have the right size on shelf, or if not, it'll probably be cheap to get 'em.
Click to expand...
Thanks Dan! I appreciate your links. I am certain that's exactly what happened. I asked them specifically if it was ethanol resistant and made of viton, they sent a reply saying "weve never had a complaint. Rubber is good quality". Lol. I just gave up and bought it because when I shopped around they all seemed to be the same Chinese part. I thought about it getting a sheet of rubber and making one myself with an exacto knife. But couldn't find anyone locally selling viton rubber sheets.
 

The original seal part number for 1968 is 1948757 which superseded to 3404451.
Many 3404451 seals can be found on eBay.
 
Another point of seal issue CAN be the tabs on the gas tank itself. If they are bent up they will provide top little pressure on the stock parts
 
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