I had the same problem on my 93 (2001), you will probably find the problem is a split hose which is under the top engine cover coming out of the rocker cover next to the oil filler cap. This area gets hot and the hoses will perrish over time.
Mantis15
March 2009
i have a vw mk3 gti and have the same problem and was told to replace fuel tank and check exhaust for leaks /fumes
mark exley
March 2008
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