Gas Cap
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Fleet Mechanic
Joined: Oct 2007
Posts: 1,981
Likes: 106
Gas Cap
When I remove the gas cap on my 64 the gas tank is always under vacuum. There is also a faint gas smell in the cab when the truck has been sitting for a day.
It was not that way on my 66.
Have I got a bad gas cap on the 64?
It was not that way on my 66.
Have I got a bad gas cap on the 64?
Senior User
Joined: Jul 2014
Posts: 307
Likes: 0
From: Northern California
Sounds like to me the cap is not venting, hence creating a vacuum while fuel is being sent to the carb.
Next time you drive it open the cap to release the vacuum first, then drive it then when you park it open the cap to release the vacuum then see if you get any smell inside the cab. How much gas do you keep in the tank?
Try switching the gas cap with your 66 to see what happens. Nowadays you can't vent because of the emissions laws on newer vehicles.
In any event I hope you don't smoke!
Next time you drive it open the cap to release the vacuum first, then drive it then when you park it open the cap to release the vacuum then see if you get any smell inside the cab. How much gas do you keep in the tank?
Try switching the gas cap with your 66 to see what happens. Nowadays you can't vent because of the emissions laws on newer vehicles.
In any event I hope you don't smoke!
Elder User
Joined: Dec 2010
Posts: 562
Likes: 1
From: Texas
My 66 has the original painted cap and when the rubber gasket wore out, I replaced it with a gasket from a new, non-vented cap.
I wanted to keep the cap for the original paint, but also because it vents the tank and the new ones that I found don't.
I wanted to keep the cap for the original paint, but also because it vents the tank and the new ones that I found don't.
Senior User
Joined: Jul 2014
Posts: 307
Likes: 0
From: Northern California
Check here and you will find original vented gas cap's.
Sacramento Vintage Ford Price is right.
Sacramento Vintage Ford Price is right.
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