View Full Version : olley black pump and holley 704 regulator
jreiley
06-09-2012, 04:24 AM
I put the above combo on my sbc. When the engine is running, the regulator does its job of limiting pressure to 6-7 lbs. However when the engine is off and the pump is on, it will not hold the pressure to 6-7 lbs but goes up to the max of the pump -14 lbs. This causes fuel to leak out of the carb. Somewhere I read that the black pump has an external bypass port. Not on mine. At least I can't find anything but in and out. The regulator has 2 output ports, 1 is plugged, the other goes to the fuel log. Should I unplug the plugged port and run it back to the fuel tank? I really don't want to buy another pump. Any help would be appreciated.
jreiley
06-13-2012, 11:30 AM
Holley not Olley. Anyway I have since learned that pressure creep is common.
TheYellaBrick
06-13-2012, 05:36 PM
Holy mollie Holly Molly, it's a HOLLEY Wally !
:shock: :shock: :shock:
fast75vega
06-13-2012, 05:52 PM
i run two holley blue pumps and they hold firm at 7 pounds.... running or engine off
I used to have this problem ,I had a bad reg
I bought a pro systems reg from them and it did it from day one now I have the big holley reg problem fixed, I run the black pump and have no return back to cell, it holds 7.5 with motor on or off
hammertime
06-27-2012, 06:46 PM
Holley not Olley. Anyway I have since learned that pressure creep is common.
Nothing common about pressure creep, regulator issue.
fast75vega
06-28-2012, 04:02 AM
Holley not Olley. Anyway I have since learned that pressure creep is common.
Nothing common about pressure creep, regulator issue.
yes sir..... :wink: :wink: