just bought 1991 f 250 to revamp for my son the person i got it from said the pump was turned up 30% how can i make sure the fuel mix is right . After he did that it only has about 3/4 throttle

 

usually i found that on those pumps u turn the adjusting screw 1/8 of a turn and that is all the further they turn them up

 

i dont know much about turning pumps is it just one mix screw and were is it

 

What do you mean it only has 3/4 throttle?

You really don't have to worry about the fuel mix on a diesel like you do a gas engine, its not as big of an issue. The fuel being turned up will simply result in more power. Is there any black smoke? If its excessive, you might want to turn it down to be more efficient, but if its light, and only when the engine lugs down under heavy throttle, I wouldnt worry about it.

 

It runs rough accelerating and Idiling. light smoke all the time. bad fuel mileage.

 

is the throttle pedal, literally only moving 3/4 of the way to the floor? or do you just mean it falls on its face past 3/4 throttle? I would also like to know how they came up with 30%..

 

Thats what I'm wondering about the throttle also.