Originally Posted by David McCollam
There are a couple of things I would suggest on the static test of your FI system. Have you taken the engine past idle for the test to observe the fuel pressure under difference RPM's. This will let you know if the pressure regulator is working correctly. If the pressure drops significantly under acceleration (below 25psi or so) you may have a problem.
Second, can you connect your pressure gauge and observe the car under load while driving. You could have a resistance problem in the FI control as you said. Also, you could have a fuel starvation problem from a clogged main filter or a sediment covered pickup screen in the tank. I would replace the main FI filter and pull the fuel sender to check the pickup screen.
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The pickup screen is extremely fine mesh which, even if you can get it clean in the first place, will soon clog up again to cause fuel starvation . . .
AGAIN! . . . ask me how I know!!
Drain gas tank (remove bottom screw (of 5) from fuel tank pickup/sender and remove it from the tank. Discard the fuel pickup screen and replace with external fuel filter between the tank and FI-pump. I'm in the process of
modifying my pickup with an external ball valve so I can shut off fuel flow when replacing the external pre-filter.