If there is a leak anywhere ahead of the pump fuel will drain back when switched off, my 606 has an MB non return valve fitted, not sure if factory or not.
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David
1996 Mercedes S124 E300TD - 129k - rolling restoration project -
1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)
Last edited by spock505; 02-22-2017 at 08:47 AM.
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