i drove 25 mins home from work (highway) - was watching the FRP and it jumped up 51 3x and thought it odd. Anyhow, I got home and realize if i turn the key back i thought i was only goin back 1 click but was going back 2 click and shutting off the scanner - so I moved it forward 1 click and it started reading fuel pressure again. It was like at 50 then kept slowly creeping up. I took stills and video of it - i was able to duplicate it twice by starting the engine again and watching it again.
I just got back from skiing and mustang was cooled down so I turned the key to the same exact spot but didn't start it and it read a constant 47-48 PSI. I started the engine and ran it 30 seconds and running 40 psi at idle and then turned the key back to just on and it stayed at 48 PSI again. so this is what I think is expected, BUT what I saw around lunch time was reading 90 psi. I figure that after it heat soaks a bit it's probably jumping to 100 psi and pushing that fuel rails up and orings out.
so what fuel pump is a good one or doesn't it matter the brand? I can hit up rockauto or just a parts store.
