what is the problem?
 

I am looking at an 2001 to purchase and am not as familiar as i am with the CR engines. The guy says that at about 2500-3k rpms that it starts cutting out, he says that he will take it to a diesel shop and see how much it will cost to fix and take that off the purchase price. I am thinking that it might be the injector pump but dont know. Thanks

rev limiter, perhaps.

Or dirty fuel filter, or weak lift pump.

Yea I would go for the weak lift pump first.

Where is the lift pump on these?

The lift pump is right below/beside the fuel filter on the driver side. it is strongly suggested that a fuel pressure gauge be install on your truck if it doesn't already have . There's lots of post on this subject.

yea your wise't thing to do is change the lift pump either way. and also put the fuel pressure gauge like floodlight said.

It's hard for me to remember, but I think these trucks defuel heavy at around 2800 rpms in stock form. But as said earlier, check lift pump and fuel pressure.
mishkaya

Do the simple and cheap thing first. Change the fuel filter. Then check the lift pump.

i guess i will let him figure out what the problem is and then if i buy i will put a fuel pressure gauge on to keep an eye on things. What pressure should it be running? with stock lift pump?