Is there anything in your other thread you think it would be helpful to know here? It seems like it would be, if this have been discussed before.
If it was a thread you started, as opposed to one with other parallel discussions in it, maybe you should revive that one instead of starting a new one so we can all know what's already been discussed and what you've done so far.
Maybe that's not as important as I'm making it out to be, now that we've started another discussion, but it comes up a lot like this and a lot gets left off the table because it's in another thread and you end up starting over on some subjects.
Just a thought anyway.
When was your conversion done, and has it ever run correctly?
Regarding fuel pressure though, that is low. Not only that, but it's not supposed to go down when you accelerate. It's supposed to go up. I think the range is 35 to 39, with some engine combos running better on 40-42, but the factory setting was 39 if I'm remembering correctly.
So you may not only have a low pressure issue going on, but low volume as well.
You say you replaced the pressure regulator though? How much ethanol in the gas in your area?
Your low pressure pump may be failing and your high-pressure pump can't pull through well enough.
You could have a blockage somewhere.
Your high pressure pump could be failing.
Your pickup could be too low, as was described.
Your pressure regulator could be failing or faulty.
What is your vacuum source for the regulator? When you pull the hose off does the engine change idle and you can feel a strong vacuum signal through it?
If you have an accumulator, it might be causing some trouble now. Not sure how, other than blockage and such.
You may have a tiny pinhole leak that's allowing air into the system.
And remember, "new" no longer means "good" so does not mean you can ignore that part because you already replaced it. Many a hair has been pulled because a new part was worse than the old one it replaced and was ignored as a possible culprit simply because it was new.
Unless you have some reason to think you need it more than not, I would start by simplifying your fuel system and go to a 1-pump setup.
Make sure the in-tank pickup (what tank?) is correct, replace any older lines, tighten all clamps, and if you see even a hint of fuel around a line somewhere, investigate. It's no longer like a carburetor that can put up with that stuff for a longer period. EFI tends to take everything personally and let you know about it!
Good luck.
Paul
