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Old 09-17-2015, 09:59 PM
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Join Date: Nov 2013
Location: Maryland
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David.X5 is on a distinguished road
I've replaced valve and the pump. Found a guy in Maryland that rebuilds them, if anyone needs that. Remember there is an electrical solenoid that opens and closes the manifold vacuum line that runs to the vacuum operated valve on the front of the cylinder head.

Anyway, what I've read is the the vacuum valves go first, allowing exhaust gases to flow back into the pump and ruining them. So, always check solenoid and valve operation when replacing one of these secondary pump
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