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 lines.one 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.
Power surges after 2500 rpm
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?
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
have you run a pressure gauge on the lift pump?the lift pump is cheap and easy to replace.you 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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