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05-08-2009, 08:38 AM
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#3
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Colonel 
Drives: E30 M3 / E46 ZHP
Join Date: Aug 2006
Location: Boston
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It's on this pic http://www.realoem.com/bmw/showparts...19&hg=16&fg=10
I am assuming the pump is used to detect fuel leaks. So all in all does nothing until you do in fact have a leak.
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