whats going on is any time i get on the gas and enter boost my fuel pressure will drop and go as low as 20 psi, my a/f goes really lean obviously. as long as i stay in vac. i dont have any fuel pressure problems. i am running the hahn port fueler with the aeromotive fpr and the hahn inline fuel pump, i checked my vac line to the fpr and its good and isnt clogged. how can i determine the cause of the fuel pressure drop?

96' eclipse gs, 2gb conversion
built bottom end, crane #16 cams, hx40 pro billet, MS1 v3 MSn'S-E, 3.55 trans, quaife lsd

That's serious. 20psi fuel pressure is barely enough to idle the car. Definitely don't boost with that, it would blow the engine almost instantly.

If you're sure the intake mani is connected directly to the FPR with a brand new hose, then look into your in-tank pump being dead. You'd probably hear the HRC inline pump cutting out, but not the in-tank. Replace with a Walbro 255LPH HP.

Did you do the fuel pump rewire mod? Use a relay to power both the in-tank and inline pumps? The factory wiring harness can't support 2 pumps.

Last thing if all the above fails, is look into a new FPR. You could try taking it off and checking it with a vacuum pump/compressed air or something I guess.