01 fuel pressure dropping

[dave05250]

my truck will flatten out at 2500rpm and has lost power recently changed filter and still not better checked fuel pressure and had about 58psi at idle when i revit with no load it will drop to roughly 40 when i power brake it and hold it i can get it down to 25 to 30psi i also replaced the fuel pump and no differance and i also checked the regulator anyone have any ideas

[dave05250]

i removed the filter today to check to see how much fuel was flowing to the filter housing from the pump and was shocked it just trickles out and spurts a little, if i put my finger over it it will build pressure but shouldnt there be a considerable amount of flow to the housing