Quote:
Originally Posted by TBatt
According to what I have read about the Walbro 255, it is a Genrotor type pump, which is a positive displacement pump ... This is what it is doing, coming on and then shutting off until the engine starts. So, the electronics seems to be working but the pump is not developing pressure any more. That could be the pump or the regulator. I'm waiting on a call from Stillen to see what there tech guys says. ...
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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.