In 2005 (all that year, it seems!) I upgraded my car.....intake, Injectors (30 lb Ford SVO), valvetrain, under/overdrive pulleys, TR224 cam, Racetronix fuel system with wiring harness, blueprinted oil pump, Shaner TB, wire mod, etc. etc.... I have a electronic fuel pressure gauge on the A-pillar and had the computer tuned for my combination. The car sat for most of 2005 as I put on upgrades. I expected the upgraded fuel system to solve a fuel pressure drop problem I was seeing at WOT. My fuel pressure before the Racetronix system was ~56 to 58 psi according to the pillar gauge and dropped to the low/mid 50's under WOT. After all my upgrades I was getting -60 to 62 psi pressure with a WOT drop to about 56 to 58 psi. Most of my driving is daily driver style with some spirited bursts of speed.
But recently during some of my driving when I crack open the throttle I am seeing a pretty severe drop in fuel pressure to the low 50's and even lower and it does not seem to recover until I let up on the throttle. My sprints are not to long as it is local road/highway driving.
I checked the fuse in the wiring harness and the connections at the relay. The wiring harness is connected to my alternator. All looks normal. Pressure at idle is normal but goes down a tad under power.
What else may be happening? What else should I check? Replace the fuel filter?
Thanks for all input !!!