So I replaced the vp44 at the beginning of January and put new fuel filter and fuel water separator on this old girl. Well here I am again in the same boat, just put a new airdog on it and it's like she's still starved of fuel. Driving down the road no matter how far down I press the pedal the truck just barley moves. But there will be time especially after it's been goin down the road awhile I'll smash the pedal down and she'll have all the power in the world. Need some help this thing is driving me up a wall

 

Do you have a fuel pressure gauge?

Luke

 

I'm ordering one today but from past experiences and with everything I've done in the past 3 days I'm going with vp44......again

 

Did you install a new or used VP44?

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have you back probed the apps..have you ever swaped ?