Hello to all, I have recently swamped a Holley 650 DP onto my 306, and havent even started the car yet with the carb and the new fuel system. The OLD fuel system gave me no issues what so ever and consisted of a Holley Red pump (7psi) and 1 single 12-803 regulator and a Carter carb with vacuum secondaries. I changed this to a different system because I want a Holley carb with mech secondaries and Im also install a NX nitrous plate system and they recommend 8-12 psi to the fuel pressure solenoid which is more than the red pump can pump out.....
My new system consists of a Holley Blue pump (14psi) and 2 - 12-803 pressure regulators which are suppose to be adjustable from 4.5 to 9 psi, 9-10 being the limit. The regulators are currently mounted together on a bracket and fed by the same single 3/8" line fromly came from the red pump where the blue pump is now: except the line is split into TWO 3/8 feed lines to the regulators with some brass fittings. I am trying to get the car running well on the carb only first then Im adding the nitrous, SO I have fuel going to the bottom inlet ports on both, and one has both outlet ports on the side blocked off with a plug and the other regulator has one blocked off and one barbed fitting and hose running to the carb.
MY ISSUE IS... That I am getting **14 PSI** out of the regulator with the key on and the pump running..... So I was like well maybe I have A bad regulator, so I swapped the carb fuel line to the other while moving the block off plug back to the suspect one and yet again **14 PSI** on that one also.... W T F....... So then I tried to adjust them while monitoring the pressure with my Snap On gauge to eliminate the Holley gauge and the SnapOn gauge reads 14psi all the time on both of the regulators regardless of where the adjuster is, all the way in or all the way out. THESE ARE BRAND NEW, One came with the Blue pump i bought from Advance Auto, the other was purchased from Jegs.....So then I thought I might have a new Blue pump that is kicking too much pressure and bypassing the diaphragm in the regulator so I tested it and the pump and feed line and found the both to be 14 PSI... REALLY???? By the way the SnapOn gauge is right, reads the same as my Matco gauge, the Holley gauge, and 2 Mr Gasket gauges.... So Iit sounds like I have 2 bad regulators but what are the odds of that.................... THOUGHTS
My new system consists of a Holley Blue pump (14psi) and 2 - 12-803 pressure regulators which are suppose to be adjustable from 4.5 to 9 psi, 9-10 being the limit. The regulators are currently mounted together on a bracket and fed by the same single 3/8" line fromly came from the red pump where the blue pump is now: except the line is split into TWO 3/8 feed lines to the regulators with some brass fittings. I am trying to get the car running well on the carb only first then Im adding the nitrous, SO I have fuel going to the bottom inlet ports on both, and one has both outlet ports on the side blocked off with a plug and the other regulator has one blocked off and one barbed fitting and hose running to the carb.
MY ISSUE IS... That I am getting **14 PSI** out of the regulator with the key on and the pump running..... So I was like well maybe I have A bad regulator, so I swapped the carb fuel line to the other while moving the block off plug back to the suspect one and yet again **14 PSI** on that one also.... W T F....... So then I tried to adjust them while monitoring the pressure with my Snap On gauge to eliminate the Holley gauge and the SnapOn gauge reads 14psi all the time on both of the regulators regardless of where the adjuster is, all the way in or all the way out. THESE ARE BRAND NEW, One came with the Blue pump i bought from Advance Auto, the other was purchased from Jegs.....So then I thought I might have a new Blue pump that is kicking too much pressure and bypassing the diaphragm in the regulator so I tested it and the pump and feed line and found the both to be 14 PSI... REALLY???? By the way the SnapOn gauge is right, reads the same as my Matco gauge, the Holley gauge, and 2 Mr Gasket gauges.... So Iit sounds like I have 2 bad regulators but what are the odds of that.................... THOUGHTS