While I was out "practicing" in a parking lot today for the up-coming autoX season, I found once again that a hard turn to the right with a full tank of gas results in overflow, leakage, whatever. Enough so that it smelled and the area around the top of the filler pipe was wet.

One other 'Lister has said it happens to him, too.

1. Does it happen to your car?

2. Have you found a way to fix it? Joe W.

 

Joe,
First check the gas cap. The seal ring can be replaced. Also, the cap can lose it's "force" that causes the click when it's fully closed, so it clicks before it's fully sealed........ And, you might take a look at the filler neck, since it can become out of round. Porsche has updated that part about 6 times. There is a procedure for replacing it on John Miles web site.

I replaced my cap, and filler neck piece in an attempt to cure an occasional gas smell in the car/trunk during warm weather, and this didn't help. Now that it is warming up again, the smell is back......not everyday....... so, next i'm going to replace the 14 year old rubber hoses.......
-Eric

(Oh to answer your question, I never get fuel out the cap when driving "aggressively")

 

Joe:

Check the archives....this has been covered many times, and the archives include diagrams as well as some step-by-step instructions.

If you've got gas coming out of the top, it's more than likely the filler neck needing replacement as well as the gas cap gasket (it's old now). If you want to do it to minimize the cash, try replacing the gas cap gasket first, then if it still leaks replace the filler cap. My car did the exact same thing as yours, and the leaking didn't stop until I replaced the filler neck too. I then had to pull the carpet out of the car and wash it thoroughly to get rid of the gas smell.

Many others have done this and it's stopped the leaks out of the top, but for some reason the smell of gas continues. I suspect it's some type of venting issue, but that's just a guess.

By the way, replacing the filler neck is not a difficult job. It took me about an hour to do.

Hope this helps,

 

Had the same problem on my 91 turbo and replaced the filler neck. Not sure if it fixed the problem but the old filler neck was corroding at the bottom and need replacing none the less. Curioius thing is that unless I replaced the neck I would have never know about the corrision and it would have eventually clogged the fuel filter.
Dennis

 

Thanks to all, and thanks, Bill, for encouraging me to continue my search. My first tries hadn't come up with what I wanted, but following your name gave me my next job for the day, what I'll now call the "Bill Wagner fuel filler leak test":

And utimately, if the gasket fix or fuel filler replacement doesn't do the trick I'll have to follow Adrian's suggestion in the same thread to charefully check out the expansion tank.

I'll let you know if I find anything unexpected. Thanks, Joe W.