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I have been following the discussion of how to get rid of gasoline vapors in the cockpit by plugging the cap vent hole with epoxy. Sounds like an easy fix. Won't vapors still come out of the vent hose that is located next to the filler neck? I am probably missing something here.
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Re: C1 Vented Gas Tank Cap
Joe, I had a horrible gas odor in my 60. So bad The wife didn't want
to ride in the car if I had to fill the tank beyond half full to get to the cruise night or show. All my components were new, as the car was frame off 3 years ago. I read about filling the vent hole with silicone but when I turned the cap over I am ashamed to say, I couldn't tell where the hell the vent hole was. So I followed Jon's suggestion and purchased the cap he mentions. Immediately the odor was gone. I will save the original cap (the one the general installed when this car left the plant!) and install it at shows when I thnk someone will actually look and know the differance.
Don -
Re: C1 Vented Gas Tank Cap
Joe, I to have been following the discussion about the 'vented/non-vented' fuel caps. I replaced the complete tank assembly and everything that goes with it on my 57 (the kit came with a vented cap). I still had a fuel odor, so I installed a non-vented cap (Stant #10810). There is still some amount of fuel odor evident at the fuel door area. It is only logical that if you have a direct vented line from the tank, you will have some amount of fuel odor, no matter what type of cap you use. I to am probably missing something. We need one of the NCRS guru's to set us straight.Comment
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Re: C1 Vented Gas Tank Cap
I too had a gas oder in my 61. Also had all new components. I bought a cap that Jon suggested (non vented) and the problem was solved.Comment
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Re: C1 Vented Gas Tank Cap
Can you tell me what your original gas cap looks like. I have some old gas caps that I think are early corvette. They look wimpy, one has no vent hole and one does. Thank, TerryComment
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Re: C1 Vented Gas Tank Cap
I have a '61 that had an odor problem especially on hard right-hand turns. I replaced the old cap with the standard vented cap from NAPA for about $6. Just yesterday I filled the car right up to the neck to the point of spilling (I was trying to check my gas gauge range) with no odor. Turns out the gasket on the old cap was thin and allowed leakage. The vent on the cap acts like a one-way check valve allowing air in but not out. I don't know why blocking the hole should even matter if it is functioning properly. I presume that your tank vent hose is properly routed and the sending unit is not weeping around the gasket. You might not have the same symptoms or success, but for a few bucks it might be worth a try with new cap. I think that I saved the box. I will post the part number here if I can find it tonight.Comment
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1961 may be a bona fide exception...
From Noland Adams' Vol 1 Complete Corvette Restoration comes this ditty...
"Dealers were alterted to the possibility of a fuel spillage problem in a Chevrolet technical service bulletin dated November 21st, 1960, cured as follows:
Fuel spillage from the gas tank filler cap may occur on early production 1961 Corvettes during right hand turns. The spillage occurs through a vent hole in the filler cap. The cap was installed on units prior to Serial No. S101750 and can be indentified by the word VENTED stamped across the face of the cap.
A new Cap Assembly Part No. 3787292 which incorporates a pressure and vaccum valve to eliminate spillage and also vent the tank is now available in parts stock and should be used as replacement on all model Corvettes."
Note, NCRS judging concensus is that all Corvettes used non-vented gas caps after the introduction of the vented tank as a running change in the '57 model year. Plus, there were several qualified gas cap suppliers in the post '57 era.
Note the Chevy Service Bulletin doesn't single out one particular gas cap supplier and simply makes reference to the VENTED emboss on the offending gas cap that got onto the assy line and actually shipped from the factory in '61...
I'm forced to conclude that there WERE times when post '57 Corvettes shipped from the factory with vented gas caps despite the fact the gas tank itself was vented and the service bulletin Noland cites makes a bona fide exception for early '61 built cars....Comment
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Re: 1961 may be a bona fide exception...
Jack,
That is a bit of interesting detective work. It never ceases to amaze me how many exceptions and on-the-fly changes were made, especially in the early days. In regards to my car, I like to drive it sans smell so the quick, cheap and easy method was the prefered path. It is a late model year car so although it was not a primary concern, the choice of vented cap being argueably correct is an added bonus.
Now only if someone could find a sure-fire fix for all of the other guys out there!
MikeComment
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Re: 1961 may be a bona fide exception...
I purchased tank, cap, vent hose and filler hose for my 60 from CC. I installed the hose that fits under the filler out thru the bottom of the compartment under the filler area. I have not smelled gas ever. I haven't installed the fiberglass cover over the tank yet. I wonder if there are different caps.
LPComment
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