Originally Posted by SouthArk370Z

Ah. I didn't realize it was a PD pump.



As you can tell, I'm no expert on car fuel systems but I do have a lot of experience with industrial pumps and control systems. The regulator would be the first thing I would check. Another possibility is the pump intake is partially blocked. If the pump motor is variable speed (I'll guess not, since it has the regulated recirc), it may not be coming up to speed. The pump itself is low on my list but always a possibility. If the recirc return line was obstructed, the pressure would be high. Low voltage at the pump (bad relay contacts, wiring is too small, cut wire, &c) could cause your symptoms - check voltage at pump motor while pump is under a load.



Hope that helps.