Many years ago in another life GE paid to send me to a problem-solving course. One of the first questions that you always have to address is 'what has changed' before and after the problem occurs. In this case symptoms could be (1) air in the system, (2) low compression
, or (3) a weak lift
pump, but given the 'what changed' the filters are the most obvious culprit, unless you messed with something else like a fuel
shutoff valve while you changed the filters. I have had problems with getting a good seal after changing out the CAV filter on a 4108, but the Racors are still a possibility.