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Fuel tank vent


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I live in Florida and I've experienced the "expanding fuel after fill-up" leak (my trunk canister is missing and the hose capped). 


If I vent the hose that is connected to the filler neck out the bottom of my trunk, will that keep the fuel from backing up out my gas cap or is it too small or close to the cap to do any good?  Or, would I be better off using the larger, unused fuel return line that attaches on the top of my tank?  (Have mercy, I've read about ten threads on the subject and still am unclear)



Edited by LateApex
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a./ don't fill the tank that high...


b/ no.  the vent connection on the fill neck is above the bottom of the gas cap.


c/ get a new gas cap with a gasket the seals better.


d/ drive very slowly on left turns so the gas does not slosh against the cap.  :D


Edited by mlytle


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The early cars vent the top of the filler boot right out of the center of the bottom of the trunk.


Yes, right in front of the muffler, but the early exhaust exits out the right side.


It mostly works, if you don't mind the smog...




"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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1 hour ago, TobyB said:

Yes, right in front of the muffler


Yeah, I saw the "euro vent" option but my car has centered aftermarket exhaust that is probably right under that hole.  I guess I'll run it out the trunk on the side near the filler.  Thanks guys.

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A trick I learned for leaky as caps:  early caps had cork gaskets; later ones have rubber gaskets.  Regardless they will compress over time and no longer seal tightly, allowing leaking and the resulting paint damage below the gas filler.  Those gaskets aren't available singly--you have to buy a whole new cap.  And as the gaskets get old, they are the cause of an increasingly hard-to-turn cap.  I took the polyethylene lid from a deli container, traced the rubber gasket on the poly and cut it out with scissors.  Placed the poly gasket on the gas cap, followed by the rubber gasket.  


Seals much tighter with the extra thickness of the poly gasket, and it's much easier to remove the cap.



'69 Nevada sunroof-Wolfgang-bought new
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I remember when I first read your tip Mike.

I went up to the shop and made a few gasket shims and then added to that post.

Here is a link, just for fun

I do still  have one left. 

Put your mailing address in a PM, if you'd like me to send it to you.


Oh, if you decide to make your own shim, here is a use for the outer portion of the lid




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