Thanks I am hoping that can be repaired, a new tank I found out is about 720.00 plus labor!! The white part of the cap is definately turning when you turn cap counter clockwise to open, where it should be staying put and only the metal tabs should move back to the opening.. I am going to have to look into further, for the mean time I am going to pick up a cheap Stant or Gates to use. The MB Caps are getting expensive to just get torn up..

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Dennis
2006 E320 CDI Black/Black Leather. Nav, HTD Seats HK stereo 32000 miles.
2000 VW Passat 1.8t 300,000 miles as of Dec 09, 2009 original owner
1997 E300d Silver 300,000 miles As of Jan 05, 2010
3rd owner SOLD