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Next time it quits unplug the pump motor and ohm test the pump itself if the ohm reading is infinite then the armature is the problem.
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That's not going to do anything... Steel is not going to soak up oil. Then not to mention the diesel fuel will wash it off the first second the pump runs. It sounds like there is a bad br
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My replacement was a 4g. It is a little longer than the old. I had move the mounting braket about 3/4" to rear to fit.
So I put that airdog 150 on my truck, and , one morning it would not start, zero fuel pressure from the gauge. After troubleshooting the obvious suspects, I took a rubber mallet and started tapping on the air dog pump itself. The air dog came to life and the truck started as normal and ran great the rest of the day. Next few days same thing, I always had to take rubber mallet while somebody else was turning over the truck and it would finally start. So I called air dong and told him I have a bad pump, and they said take the gears out the side and soak them in motor all overnight. I have not done that yet? Is it a waste of time or has anyone else had this problem before?