Thanks so much! Under closer inspection (popped the engine cover off should have done that before) it is defiantly coming from the bottom of the filler neck. Looks like #41 is the problem, however if the entire assembly is only $16 I might as well replace the whole thing. Rene what’s the trick to getting that thing out? Twist counterclockwise and pull really hard? Do I need to do anything to the new part before install?

Thanks so much for the top notch responses, Fantastic Pictures that sure makes it clear. This forum Rocks!

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1998 ML 320
BIG Sound