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Fuel Leak

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Nickp

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Fuel Leak[FONT=verdana,geneva"] [FONT=verdana,geneva"]At Croft yesterday I noticed that my car started leaking fuel out of the filler cap ( I think) even though the tank was only half full.[FONT=verdana,geneva"]I have never had this problem before and the strange thing is it only seemed to happen on one bend, the second right hander after the start finish straight (sorry cant remember the name) on the rest of the lap it didn't happen. [FONT=verdana,geneva"]Does any one have any ideas on why this should happen? [FONT=verdana,geneva"] [FONT=verdana,geneva"]Any help would be appreciated.[FONT=verdana,geneva"] [FONT=verdana,geneva"]Thanks[FONT=verdana,geneva"]Nick[FONT=verdana,geneva"]
 
Nickp

Yes this happened to me. It is a known problem. There is a flap (in effect a valve) inside the neck of the filler this wears out and stays open. When you corner reasonably hard the fuel surges out of the vent inside of the filler flap. Paul from gt classics did mine under warranty (no fuss) so i have no idea of costs apart from a vague recolection of £100 parts mentioned.

Once filler neck replaced no further problems. My technical knowledge of this may be slightly dodgy but it is the filler neck any specialist will be able to advise on correct pats needed.

Hope this helps
 
I had a similar problem that seemed to be cured by replacing the filler cap. I just swapped mine out to see if it cured it and it did. I used my Boxster one to test it. My guess was it was the rubber seal on the filler cap had perished.
 
Sounds like you may need to replace the filler neck - Part No. 964.201.043.06 £98.70 + VAT

Replaced mine back in April - so the price was right then, don't know if there have been any increases since. This part is an improved part from the original one and has a more secure joint to the body.
 
It did Phil, but there again, you don't get to give it the same enthusiasm when cornering on the roads in South East London.
 
Had exactly the same issue as 'rs phil' on track. Tried different fuel levels and new filler cap to no avail.

New filler neck solved the problem. I think the angle a fuel pump sits in the neck whilst re-filling can cause it to become deformed over time esp if you lean on the pump whilst re-filling.

 
It's a 17 year old piece of plastic - you can't expect miracles. I find myself having to replace various little parts from time to time, just because they have deteriorated over their life.
 
i am used to replacing parts on old cars...its part of the experience...this is nice and easy to replace and cheap for a change,no miracles expected here[:D]
 
Phil, I had it also on mine and there was a description (on Rennlist I believe) of how to correct it.

But I mentioned it to my local Specialist and it seems to have been cured ...

Mine was shown by an evaporation stain running from the filler cap down the wing ...
 
Quick tip guys. Before starting the job, buy a big pair of circlip pliers, normal ones (including the ones with interchangable heads) just aren't big enough. It will make the job so much easier and quicker.
 
yea spotted that,heated my bent ones earlier and made them straight...poped it off and back on...still waiting for part
 
ok got filler,took only 10 mins to fit,when fitting new one lube up the rubber grommet before pushing through towards flap, i used some tyre gel,found the problem with the oe one,when you blow through either pipe it blows straight out at cap end,with the new one this doesnt happen it seals so fuel cant get out,but if you take your thumb off one pipe and blow it bypass through each pipe...this will defo sort the problem...hope this doesnt confuse[:)]
 
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