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When I fill the tank on my 31 coupe gas leaks out of the filler neck. I don't fill the tank all the way, and I've added a rubber gasket to the cap. Any suggestions?
Thanks,
Sid
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Jul 2012
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Backyard Mechanic
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Backyard Mechanic
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My friend you are sitting on a bomb,If you don't get that leak fixed. Your tank may also have pinhole leaks from rust.
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Gas cap is a reproduction from filling station and is vented. It had a cork gasket. Maybe 2 cork gaskets would be better than rubber. Gas tank is an original in very good shape with no pinholes. It came with the car.
Sid
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Joined: Mar 2016
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Shade Tree Mechanic
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Shade Tree Mechanic
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There is a 31 nos non vent gas cap on ebay $10.50 (1931chevyparts)ebay.
1 1/2 " neck. might cure your problem.
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Joined: Mar 2016
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Shade Tree Mechanic
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Shade Tree Mechanic
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jmm is right, we rebuilt a house where the gas tank leaked & set the house afire. If that happens you can kiss your car good by.
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Joined: Mar 2016
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Shade Tree Mechanic
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Shade Tree Mechanic
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If you fill the tank with cold gas, then it warms up & expands out of the tank, the fumes are dangerous.
Good luck
Dulty
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I believe the gas is sloshing out between the cap and filler neck. It didn't have time to heat up in the 2 miles from gas station to my house.
Sid
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Joined: Nov 2001
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ChatMaster - 15,000
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If you fill those tanks to the top they will push gas out when heated or slosh it out. Best to leave a noticeable gap between filler pipe and liquid level. That will give you ~ 10 gal. capacity instead of the 11 listed.
You can put a leather gasket in the cap. Cork will work if everything is smooth. Otherwise any roughness on the filler neck will abrade the gasket. Rubber that is compatible with gasoline is not generally to spiffy with alcohol. The best with gasoline are Nitrile, Viton, Polyurethane.
How Sweet the roar of a Chevy four!
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I had a similar problem with my 32 and the replacement vented non original style cap with a rubber gasket solved the problem. Check the top of the flange on the filler neck also and when the cap is installed it needs to be snug. If necessary a thicker gasket or double up.
Steve D
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Okay. Thanks guys. I'll look for an old leather glove and make me a gasket.
Sid
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Joined: Mar 2016
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Shade Tree Mechanic
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Shade Tree Mechanic
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Sid. some gas station drives lean out to fill tanks with more gas then, if your floor leans in the tank is too full.
I went to our gas station pump company & bought their gas gasket material for my fuel pump diaphragm . it is a lot better stuff then what you get when you order it. My fuel pump last a lot longer cut your own diaphragm out & punch out the holes.
buy about a sq. foot for $5.00.
Dulty
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I would not use leather. Find some rubber that can hold up to the gas.
Steve D
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Leather works! I cut a gasket out of a leather work glove. Drove the car today...no leaks! Thanks Chipper.
Sid
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Glad to help. Will we see you next week at the Spring Tour in Tennessee?
How Sweet the roar of a Chevy four!
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Yes. Got the 41 ready today. See you there.
Sid
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