Not sure if this is my issue yet,,,but,,,need to know how to "adjust" the bypass on my fuel pump.
10 sec, bracket car,,,fuel pressure bouncing around,,I replaced the pump ( was a old, small, holley black pump ).......put on a Mallory 250.....AND a "small" inline summit 40 micon filter before the pump.
Fuel pressure seems fine for a bit at idle,,,,,but when i launch,,,,it drops to 3-4 all the way down the track,,,and would not come back up on the return road,,,or in the pits.....
Pulled the small, inline, 40 micron filter off,,,and it looked a bit "gummed" up....cleaned it out,,,,fired it back up,,,and fuel pressure now normal,,,,,,, drive around,,,race,,,,and pressure drops again....
SO,,,,,,,,, i am thinking i have too restrictive of a fuel filter before the pump ?
I replaced the "small" filter with a Aeromotive 100 micron filter,,,,and so far,,,at idle,,,in the garage/driveway,,,,the fuel pressure reads normal,,,,,,BUT,,,,,have not had a chance to run the car yet......
Hoping to get to the track today,,,,,,my concern is what to do if the fuel pressure drops again down track,,,,,,( which should rule out a filter problem)
I am wondering if the next thing to consider could be the bypass on the fuel pump ??
Not sure how to "adjust" the bypass,,, ( i know "how" to and where the adjustment is ),,,,but which way to turn the adjustment screw ? in ? out ? how much ? I dont have a gauge after the pump,,,and before the regulator as of yet,,,,,
just want to know what i can try if i get to the track,,,and the fuel system starts acting up,,,,
ps,,,this is a dead head system ( for now )
sorry for the dumb questions,,,,,,,,,,thanks for any help.
This is my last ET,,,,running down track with 3-4 lbs of fuel pressure,,,,hoping to get out this weekend and take a shot at a NINE...........