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Most of the time it's the check valve. We use a blow gun to the tank and just try and regulate (guess the pressure the best we can). I also have a soldier up top bleeding who will yell when the fuel starts to flow where it is bleeding. I did have one where the plastic threads on the separator...

So I just dealt with this last weekend on 5 different trucks at drill as my unit has over 50 HEMTTs, typically we have found it's the check valve just outside the tank or possibly the water drain cock is stripped out as it's just plastic. Just had a truck pulling air bubbles in through the...