this has been a thorn in my side for a while now, ive been racking my brain and combing the internet as well as holley's tech line; but to no avail. Its a 66 c-30 with the original style tank behind the seat. All components have 150 miles or less on them. From tank to carb- 3/8 line all the way, a corse bag screen in the tank, a clear screen filter just outside the tank, holley blue electric fuel pump mounted on the frame; it only has about 20 min run time on it (had the problem, replaced the pump, still had the problem), then a fine filter, simmilar to an oil filter- its a permacool fuel/water sepperator filters to 2 microns, thento a holley fuel pressure regulator, deadhead style (#12-803) brand new as of today, with a guage on the inlet side as well as on the outlet side, then into a holley 600cfm 4160, non adj floats, vac sec's. The problem is that something is causing a pulsing effect. I checked the voltage and its getting a steady relayed feed, the clear filter in the cab is wooshing. . . ? Fuel shoots through then stops, thenshoots through etc. at the regulator guages show that the incoming pressure slowly drops down to 6psi then goes up to 12-14 pretty randomly, which affects the outlet side accrdingly and it has something like a shudder that can flick the inlet psi up over the 15psi mark, which the holley tech guy told me the pump cant go that high unless there is a voltage spike, but ive tested the leadsand they are fine. Any help or suggestions?
