Sounds like a leak at the pre-filter o-ring (big one). Has separate part number and doesnt come wiht the pre-filter.

The fuel line from the fuel thermo (in the head) to the top of the pre-filter should drain back at shutdown. Is normal.

Air in the line at the bottom of the pre-filter filter housing is usually the big o-ring. If new, check to make certain it is sealed up good.

Park nose down in mean time to help wiht hard starts.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)