Thanks for jumping in Art - no puff is perhaps the wrong word, I did not feel like there was air coming out just fuel and just eyeballing the volume of the rail it seemed like the right amount for about 35 psi. The threads on the HF pressure gauge are toast - brass too soft, I guess I didn't expect it to last too long but 4 or 5 times on and it was toast.

Yes I've operated both pumps during the no-start time from the fuse box with fuse 4 removed and can hear them running one at a time, first power to the left then to the right. Main pump hums pretty smoothly. In my mind I have 2 buckets, one says "could be intermittent" and one says "probably not intermittent" and I guess I had the FPReg in the probably not but when I get home I will swap the regulator out with one from the 740 (which has never not started for its entire 21 years since assembly in Belgium in 92) and see what happens.

This no start will very occasionaly happen from a dead cold at morning temp of 70 or so, so probably not vapor lock. The next move seems to be into "subjective" - take a plug out and check for blue spark (maybe my dash spark gauge is too sensitive) and get another pressure gauge and leave it connected so I know for sure there is at least 35 psi when it won't start. I had trouble before with gas leaking out the schrader valve before though no matter how much teflon tape I used.

Robb McC