Engine losing power while driving!?

[gear jammer 91"]

This is on my brothers truck it's a 93 2wd dually. He just bought it, the motor has been replaced recently and it looks like the pump is also new. A couple weeks ago he brought it over and I turned his pump up, bottomed out the star wheel, set the pin deep, and removed the collar on the full power screw and turned it in a couple turns. When I removed the full power screw fuel spilled out of the pump, and then stopped. I put the screw back in and all was good, until today. My brother called me about halfway to Seattle and said that while he was cruising down the freeway with the cruise set the truck lost power and it felt like he had just pushed the clutch in. With the cruise off it still does the same thing, It idles and starts just fine but loses power randomly while driving. He says if he lets off the throttle and then gets back on it, it comes back to life for awhile then does it again. He finished his trip and by the time he got to his destination everything was fine again. My question is what could have caused this situation? Could I have gotten air in the pump when I had the screw out? and would that cause this sort of problem? Or does he need a new fuel filter? or a lift pump? Any Ideas would be appreciated. Sorry about the long post.

[CumminsPride]

I'd try a fuel pressure guage and then determine what the culprit is! A new fuel filter would always be a good idea when purchasing a new truck as well as new fluids throughout.

Wade

[PToombs]

Then if a filter doesn't change it, put a fuel pressure gauge in and check that. You can plumb one in temporary, just run some hose into the cab, or on the hood. Anyplace you can see it.

[gear jammer 91"]

Thanks for the help. I'm gonna change the fuel filter as soon as my brother is back in town, and go from their.

[dpuckett]

Check the wire to the shutdown solenoid, and the connection to the solenoid. I've had them come halfway off, and do the same thing. I guess it only gets partial voltage, and holds the solenoid partially open, letting some fuel by, but not what's needed.

Daniel

[gear jammer 91"]

Thanks for all the help. The problem seems to have disapeered with a new filter in place, hopefully that was all it was.