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| | | | Joined: Nov 2016 Posts: 12 'Bolter | | 'Bolter Joined: Nov 2016 Posts: 12 | Hi all,
I have a 1952 Chevy 3100 truck that has a persistent odor of gas in the cab. The gas tank was replaced by the previous owner. I’ve noticed what looks like residue from dried gasoline on top of the gas tank, along the entire length of the seam. Is this a common issue with replacement fuel tanks? Any clever suggestions, other than replacing the tank, to remedy this?
I noticed that the tie straps that secure the tank to the cab floor caused the gas tank seam to bend. Maybe this is the cause of the leak?
Thanks in advance for any suggestions on how to proceed. I’d like to avoid buying a new gas tank, but it would beat smelling like gasoline every time I drive around the block.
Thanks!
Billy | | | | | Joined: Apr 2009 Posts: 554 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 554 | Have you checked that the filler neck and vent tube hoses are in good condition and the clamps are tight? | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | Also check that the sending unit gasket is not leaking. | | | | | Joined: Jan 2000 Posts: 734 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 734 | Don't worry about the bent seams, they're pre-bent to form a saddle for the straps.
Matthew 6:33 1952 Chevy 1/2-ton 3100 Late '55 235/SM420/torque tube 3.55 Dalton Highway survivor (using original 216) www.truckwithaheart.com | | | | | Joined: May 2015 Posts: 11,150 Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums | | Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums Joined: May 2015 Posts: 11,150 | If you find that it's not the sending unit gasket or the filler, there are cleaner/sealer kits available for gas tanks. I've seen them on Eastwood's site. My tank will eventually get that treatment, even though I don't believe it's leaking.
Kevin 1951 Chevy 3100 work truckFollow this saga in Project JournalPhotos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together. | | | | | Joined: Nov 2016 Posts: 12 'Bolter | | 'Bolter Joined: Nov 2016 Posts: 12 | Thanks for all the replies. All of the hoses are in good condition and the clamps tight, so I think this may be a shoddy seam weld? Skooker - thanks for the info about pre-bent seams. I thought this might have been the problem until I read your note. I'll look into a sealer kit. | | | | | Joined: Mar 2010 Posts: 10,303 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,303 | Did you replace the sending unit gasket? The new style rubber (PVC, maybe) ones have under-sized screw holes for a 100% seal as compared to a dried out original cork seal.
Old sending unit gaskets are notorious for leaking fumes which will rise up, flow out, and collect on top of the tank.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Aug 2016 Posts: 34 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2016 Posts: 34 | I just changed my tank and all the hoses and the sender and also have a fuel oder when full. I tracked it down to the screws holding the sender in. The gas sloshes and the gas push through the screws. A thin coat rtv on the gasket and the problem went away. | | |
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