HI guys, I'm a Fass Dealler and have been installing the fass pumps and inj. pumps for a couple years now. This is what i have come up with. For the hard starts all the time, ..... it usually meens that the VP is a little worn and won't take the higher pressure. Not all FASS pumps are set the same pressure. To fix this you need to pull the line that goes to the return back to the tank. Then under the fitting there is a spring and a ball. Just pull the spring out and cut a half coil at a time, until the truck starts perfect every time.
As for the hard starting only when its hot, the extra pressure is not helping and your VP is getting worse and should be changed. Lower your pressure to get by, but the VP 44 needs to come off soon before you are stranded.
As for the truck that would lose pressure from time to time and not pick up, here are the two problems i have run into. One time the filter was a Cimtek and did not fit right and i put a DDP filter on it and it worked fine. This happened recently, I hope no more units come with that filter. The other problem was the little block on top of the pump that controls the air/fuel bypass back to the return had a weak spring and it would not hold pressure or reprime itself all the time.
All in all, these pumps are pretty good and beat many of the alternatives. I think that if you can't find a dealer that knows anything, that in the worse case problem if you call DPP, then talk to Rebeka. She knows the pumps backwards and forwards and is very nice and patient.
I hope this helps. If anybody has any questions feal free to send a PM or call, or e-mail at -- email address removed --