df 140 won't pickup rpm's

[gkf1813]

2004 DF 140 engine will idle all day in neutral and can even raise rpm with lever on controller but put it in gear and under a little load and it acts like it is starving for gas. will not pick up speed although it has never left me stranded it gets me back to the ramp but slowly fortunately I don' get far before it acts up.I've put hi pressure fuel filter and low pressure fuel filter on and new portable gas tank, fuel lines, pump ball, water separator and rebuilt fuel injectors on also still have same problem. does anybody have any ideas. engine has less than 800 hours on it. I did have some water in old tank but should have fixed that with parts above

[Solarman]

Do you have a manual?
Does your motor have an inline filter inside the hose at the bottom of the VST that goes to the high pressure pump?

Good luck.

[catacom225]

won't pick up

Sounds obvious It's starving for fuel and looks like you have covered the basic components, so I think Solarmans suggestion on giving the VST a clean would be the next step