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Gas Pumping Out of the Tank Fill Point

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#1 RonK


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Posted 17 September 2012 - 05:45 AM

"Tank Fill Point" (where you put the gas in) ... Last week I filled my tank and noticed the smell of gas driving down the road. I'm at a stop light and I think the young lady rolling down her window wants to comment on how neat my car is.... Instead, she tells me I have gas leaking out of my gas cap area.

It took a while of repeatedly shutting down and letting the gas settle, starting it up only to still have it pumping gas up and out of the fill point.... finally got in and drove home a few miles hoping I wasn't going to blow up.

It stopped and hasn't happened again, but then I'm afraid to fill it up and have it repeat the problem, so I've been only putting 10gals in at a time.


#2 SleeperZ



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Posted 17 September 2012 - 07:00 AM

Factory engine? Turbo engine? Modifications?

Sounds like you may have a plugged tank vent or carbon canister.

1978 280Z -->  L28ET, MS3, T3/T4 (V1/V2), 440cc injectors, Spearco IC, BW T5


Otherwise all stock.

#3 Darrel



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Posted 17 September 2012 - 03:33 PM

Cap on straight? Rotted hoses? It could mean anything. You need to get under and take a look.
82 280zxt 4 spd auto
73 240z--lsd, cv axles
things will only bother you if you let them
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#4 Miles


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Posted 17 September 2012 - 04:39 PM

First of all you don't mention what type of car it is which would help others solve your problem.

I suspect that you overfilled the tank on a warm day, the fuel expanded, and pushed out under the gas cap. On my 240Z if I overfill (top off) on a hot day the fuel will expand and run out past the gas cap. As long as I don't top off the tank there are no leaks.

“Life is like arriving late for a movie, having to figure out what was going on without bothering everybody with a lot of questions, and then being unexpectedly called away before you find out how it ends.”    -Joseph Campbell

#5 RonK


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Posted 12 March 2017 - 05:26 AM

My sincere apologies for not replying... it's a 1975 280Z and I have since learned to not overfill. :)

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