You will NEVER get all of the air out of the prefilter, there is always some in there and it is perfectly normal.
I agree with Vox that you may very well have a problem with the lift pump (the mechnical fuel pump driven off the side of the injector pump).
When was the last time the valves were adjusted????
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Marty D.
2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz
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