Power loss during acceleration

[mblaire]

1999 F350 7.3 diesel, 6 months ago replaced filter in fuel tank and engine, new fuel pump and added fuel presure gauge. Engine ran and pulled very well. Fuel presure maintained about 62 PSI.

NEW PROBLEM: Fuel presure drops drasticaly when I accelerate or incline increases. If I am driving on a level road fuel presure will slowly rise to about 59 or 60 with gradual acceleration but it will have a tendancy to rise and fall within a 2 psi difference. If I accelerate quickly PSI will drop to zero.

Could it be the fuel pump? If so is it better to go with OEM or after market?

[greasltn]

It could be the fuel pump, or a restriction in the fuel system (filter or sock).

[ajpu1983]

Could be sucking air

[mblaire]

Replaced fuel pump and problem corrected.