I can't get the fuel pressure to stay at 58 lbs. I have changed out the regulator twice and I bought one from Fitech and it is in there now. The pressure starts at 58 when I first change the regulator and then after driving for 15 minutes it drops to 50 and then while idling it keeps dropping to 40. I have a brand new aeromotive 340 pump . I have replaced the wiring with 10 gauge from the alternator using a relay. When blocking off the return line the pressure builds to 100lbs my gauge is right before the inlet to the throttle body. I also changed out the hose from a 6 to an 8 gauge and changed my filter to an 8 so that there are no restrictions. I also removed the filter and no change; it did not help so I put it back. It has been doing other weird things lately. It also has power fluctuating erratically.
- This unit is on a 383 Chevy motor.
- Has a #8 hose from intank pump to the fuel filter at the throttle body unit.
- Has a #6 return line.