The thing to do is a fuel quantity delivery test, per Bentley. You
unplug the RETURN fuel line from the pressure regulator fitting and run
a hose from it to a clean container. Then hot wire the empty FP relay
socket for exactly 30 seconds. Then measure how much gas came out of the
regulator return fitting during that 30 seconds.

Bentley page 20.19 says how much fuel is the minimum acceptable in 30
seconds, measured at NORMAL SYSTEM PRESSURE!

The pump runs 100% of the time when the engine is running. Most of the
fuel it pumps goes back to the tank from the pressure regulator return
fitting. As engine load increases less and less fuel is returned because
the engine is using more of it to make more horsepower. As long as the
fuel delivery system can deliver at least as much as the engine will
ever demand then it is doing enough. This test is meant to prove that it
can meet the highest possible fuel demand. Your symptom sounds like your
fuel system doesn't always keep up with peak demand. It can be limited
by blockage in the tank, blockage in the filter(s), weak fuel pump, or
weak electrical power and/or ground to the pump.

Do the test. Then decide if parts are needed.

Mark