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      08-25-2009, 08:14 AM   #27
jeremyc74
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Drives: '08 135i Montego/Terra
Join Date: Feb 2008
Location: Evansville, IN

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Quote:
Originally Posted by imported_mega View Post
I would love to see some pictures of what actually fails on these pumps

Same here.

If you look at that cutaway, at the bottom you can see a slanted disc, which is what drives the pistons up and down. The fuel would have to lubricate the cups on the bottom of the pistons, so there's one wear item for sure. The piston seals would be another obvious one.
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