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Joined: Jan 2007
Posts: 1,441
ChatMaster - 1,000
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OP
ChatMaster - 1,000
Joined: Jan 2007
Posts: 1,441 |
I had over a quarter of a tank of gas evaporate from my 37 over the winter so I presume the vent is constantly open and todays gas is probably more to blame.
VCCA #45194
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Joined: May 2002
Posts: 6,149 Likes: 42
ChatMaster - 6,000
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ChatMaster - 6,000
Joined: May 2002
Posts: 6,149 Likes: 42 |
I know gas does evaporate but during the cooler times at a slower rate. A 1/4 tank seems to be a very high quantity for very warm temps though so I would suspect there may be a small leak contributing to the issue.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Jan 2007
Posts: 1,441
ChatMaster - 1,000
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OP
ChatMaster - 1,000
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No leaks that could be found.
VCCA #45194
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Joined: Jun 2007
Posts: 1,894
ChatMaster - 1,500
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ChatMaster - 1,500
Joined: Jun 2007
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Be difficult for that much gas to evaporate through a pin hole in the cap. If there was a leak I'd think you'd likely smell it and see residue/staining as the loss would be a few gallons.
Maybe the gauge isn't reading correctly now or when put away in the fall? Maybe the sending unit is a bit worn right around that particular level so in the fall it read high and then after sitting it made a better connection and read low. Maybe the ground to the sending unit developed a bad connection over the winter?
Ethanol in the fuel can mess with the cork floats if they are original so maybe the floats are fuel logged?
1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!)
1975 4-speed L82 Vette
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Joined: Aug 2004
Posts: 3,469 Likes: 48
ChatMaster - 3,000
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ChatMaster - 3,000
Joined: Aug 2004
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A 1937 pickup does not vent through a pinhole in the cap. There is a 1/4 (or so) vent tube that lets fumes from the top of the tank exit the cab through the floor pan under the tank. It is a one year only arrangement, as far as I know.
All that being said, 1/4 tank is lots of fuel to lose in cold weather.
Mike
ml.russell1936@gmail.com
Many miles of happy motoring
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Joined: Jan 2003
Posts: 318
Backyard Mechanic
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Backyard Mechanic
Joined: Jan 2003
Posts: 318 |
Speaking of gas tanks, mine has been inactive for awhile while I am doing some work on the truck and I also have lost gas from my 37. It prompted me to put some Stable in the tank and now the fuel line to the fuel pump is blocked. I may have to pull the tank to clean it. Something I have never done.
See Facebook Page for Joe Fuchs to see more pictures of my 1937 Chevrolet 1/2 Ton Pickup
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