Quote: I watched the video & a light bulb came on, I have ran into that once decades ago & it was a pump (valve sealing) issue!
This pump is brand new! I figured the pressure swings were because of the return line bleeding off pressure from each pump cycle.
Would reading that gauge while cranking the car be accurate on what it's doing while running? When I am cranking the car the needle jumps up to around 5psi and then just drops back. Once about every second which I'm guessing is from each pump cycle.
I will try to get a helper to crimp the return line and see if I can take a video of what happens to the fuel pressure.
I was just hoping somebody here has this setup and had monitored fuel pressure before and could tell me if this is normal.
