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Power surges after 2500 rpm

10645 Views 27 Replies 6 Participants Last post by  1dieselman
Well, I did a search and I can't find anything that is the same as my problem.

What happens is, at 2500 rpm, if I increase the throttle there is less acceleration than there should be, then at maybe about 2600 rpm, the truck will surge up to about 3000 rpm without a change in the throttle.

Seems like it happens only when the truck is warm, and maybe been on the highway for a while, but I also don't rev it that high when cold so I am not 100% sure of that.

I am guessing the IP or lift pump, but IP is the only thing that makes sense to me.

Has anyone experienced the same thing or have any ideas?
1 - 2 of 28 Posts
how old is the fuel filter? before you change the lift pump try a vacuum test on the pump if it has less then 12 inches hg replace the pump.are the fuel sending unit in the tank old, if you have just a pinhole in the metal line coming from the tank you can be getting air in the system.(air and diesel fuel do not get along in a diesel engine)install 2 clear fuel from fuel filer to the return line the other from the i.p. to the return line(i have a pic in my photos)if you see bubbles in the line you are getting air.if there is no air in the fuel then try the vacuum test.
have you run a pressure gauge on the lift pump?the lift pump is cheap and easy to can replace the fuel line from pump to the selector valve with rubber fuel line hose.
1 - 2 of 28 Posts
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