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Message:: [QUOTE="wore out, post: 12230392, member: 117153"]I would put a restriction gauge on the front side of filter housing or between filter and pump.0-2 is sucking air3-7 is normalAbove 8 is a restriction Cummins put their filters on the suction side so start there. Make sure the drain on bottom is sealing properly but they are usually hard to start if that’s issue. There is a wide funny looking plug on top of the pump takes a big flat head, under it is a washable screen check it for sure odds are that’s at least part of the issue with that trucks age. I would lean toward fuel supply because it seems power related. You also didn’t mention any smoke timing issues almost always have smoke with them.  Just for giggles turn the manual screw on the pump all the way in see what that does. The 444 was an STC engine. The timing was changed or controlled by oil pressure. That could be an issue not trying to step on anyone’s toes but the 444 was good when right but seldom right and few could get one right. Many were converted to big cam 3’s. Thing there is we’re they marked with the CPL  they were converted to. So parts may be a shot in the dark. Finding someone to work on a 444 that’s actually seen one is a shot in the dark. They are not a simple big cam. Not that they are complicated but education is expensive. There is a way to check the STC with regulated air psi but I rather not type all that if I don’t have too.[/QUOTE]