ive had alot of ve pumed trucks- some low miles some high. some with rebuilt pumps some . ive noticed the fresh pumps seemed stonger but no way to compare, anyone ever replaced a running hi mile pump with a rebuilt one and noticed a difference? thanks.

 

When I worked in a fuel inj shop we always set the fuel on the high side of the spec. and I think most shops do also so yes they would run better. Ken

 

When I replaced mine, I had a definite increase in power, but the instructions that came with it said to push it all the way to the head, so I don't know which one or both did it...Mark

 

I mainly noticed less noise and my oil pressure was much better when the truck is hot. hard to compare power and performance as my pump was never tampered with when i brought it in and got back a fresh unit with a timing bump and a couple turns on the fuel.

 

I'd say it depends, on if the "rebuilt" pump was just re-sealed, or if it got a reman head/rotor assembly.