Since posting the previous I've discovered that some of my Audis have the wrong size fuel tank fuel pump grommet installed. In fact the 02 3858 4 posted in my previous is the wrong size. The proper size is 02 3858 7. (The Audi Part number posted previously should be the correct part. The numbers above are not Audi numbers and I do not know whose numbers these are. Whose symbol or Icon is three Audi Like Rings instead of 4?) Anyway, the grommet must fit the fuel pump and if it's too big the pump will suck gas from the unfiltered tank supply instead of from the in tank fuel return supply which is filtered by first your fuel filter and then the screens in the large plastic fuel return device bolted to the bottom inside of your fuel tank where the grommet and the fuel pump are both mounted.
I suspect a short cut mechanic thought he could solve a fuel problem by bypassing the protective device. Such apparent stupidity happens more often than one might expect! Watch out for fuses bupassed with tin foil!
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