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Yeah the gauge is attached to the test port on the left fuel rail, I never remove it. FP goes up around 34lbs when I shut off the engine and holds for around an hour before it will start slowly dropping and get near 0 within a couple hours. I can't find any pattern to how it starts related to FP at that time so it doesn't appear to affect the issue.
The new fuel pump came with a new check valve too. I replaced the previous pump because I had the gas tank out recently to replace the belly pan due to a rust spot near the suspension arm and the guys doing the work said they saw some crud in-line in front of the fuel pump. I had hoped they would find the cause of the problem when doing this work but that was all they found. And it still had the same warm hard start when they put it all back together so I thought well maybe that crud in the line had been clogging\damaging the pump. But no, the new fuel pump and new check valve seem to work the same.
I had the whole fuel tank drained too during all this, twice, the 2nd time it looked clean. Also changed the fuel filter afterwards, it looked clean although when I changed the fuel filter a couple years ago when I first bought the car that one was pretty dirty.
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