Check for any bubbles present in the plastic fuel lines.

When was the last time the orings on the kill switch on top of the fuel filter were changed? How about the pre-filter oring?

Put a jar of B99 outside where you can see it so you know at what temp it gels.

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Terry Allison
N. Calif. & Boca Chica, Panama

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