Spill out of the filler pipe (2WD) --> replace the filler pipe with the
lastest version. It got a small ball valve at its bottom to prevent just
that spill (if you look into the parts micro fiche / CD you - or your VW
parts guy will find 3 - take the 1 on top). Runs about 100 bucks, easy to
replace, feel free to ask for details.
Other spills --> check / replace grommets on top of tank, i.e. drop tank =
more pain.
Michael, Germany w/gas at 4 US$
80 Westy
86 GL (had both of the above spill types)
86 Quantum
93 318t for 1 week now - did you know how bad bmw is compared w/VW?