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RETIRED
Join Date: Jul 1999
Location: BOULDER Colorado
Posts: 39,412
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I would have guessed check valve, i've had two instances of that failure. Good on ya for fixing it so quickly. I no longer have CIS but DME, trouble free so far except for a bad fuse....
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1983/3.6, backdate to long hood
2012 ML350 3.0 Turbo Diesel
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