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Old 09-12-2013, 11:38 PM
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Diesel911 Diesel911 is offline
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Join Date: Sep 2007
Location: Long Beach,CA
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I am not sure which vehicle you are speaking of. On My own and others with the same Model it is common to have an Air Bubble in the Plastic Filter.

when you reeve the Engine the shape of the Bubble may change some but what you don't want to see is the Bubble or a string if tiny Bubbles moving on into the Fuel Supply/Lift Pump.

If you are speaking of your latest model Mercedes I have read that the Fuel Pressure Relief/Overflow Valve has some tiny Plastic Part inside that deteriorates.
On the Same later Models the Fuel Supply Pump has Disc Valve that do not hold up as well as the type of Valves on Mine.

New Style fuel Supply lift pump rebuild
OM606 Fuel Pump Rebuild - PeachParts Mercedes ShopForum
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