Originally Posted by Sudia247
So it's normal to drop fuel pressure under load? But the fuel filter is new, about 2k miles on it. I removed the fuel heater as well.
I was thinking it could be a failing lift pump, but I wasn't sure, Ill give it WOT and see where it drops to or if it stays at 20 PSI..
As engine rpm increases the lift pump produces more volume so it shouldn't drop much at all past 20. You could raise your baseline pressure up a bit more. If it drops when rpms are raised with no load then you should be looking for issues.
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