I was going up a small grade hill with a little load and the truck wouldn't go over 2,000 grand,but ran like a champ before it hit 2,000 it nose dives and wont go over with it mashed,all temps cool all fluid levels are good!I was thinking boost leak but that would be black smoke?Any input would be helpful!

 

air intrusion in fuel or low fuel pressure to IP..

 

Bad lift pump?

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Also there is a guy in town who wants to hook chains and throw 5k behind our trucks and do a 1/4 and see who wins!He has a bone stock 2006 6.0 powerstroke and read my sig!Think I can win or na?I've only hooked chains one other time but I had a LBZ dura at 450rwhp and sittin on 37's so im really not an expert on all this tug-a-war stuff?

 

Not with the way it runs now. ... And yes possibly lift pump .... Check or change fuel filter s .... Let us know ....


S far as a tow contest ... With truck to truck .. Its not a real good way to determine a winner ... But with a block .... Actually sounds like fun .... My 2wd would be fun to do that with .... Might actually win for once

 

Alright thank you and will let you know if I get her fixed

 

Good deal ...

 

Replaced fuel filter and it ran great but i didnt have a load on it but i let a family friend borrow it to run a 10k load to North Carolina from Az today so lets hope that was the problem but buying a new lift pump just cause its got 200k miles on it