how much pressure should a piston lift pump have?
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No, and there's 2 different bore sizes as well, but I believe all the springs should be interchangeable. I got a pump off eBag last year, not sure what it was for, maybe an AG or stationary application, probably the 10psi pump I suspect. Anyways, what I plan to do is take it apart and compare with my known 15psi 3220 currently on the truck one of these days if I ever get around to it. If and when I ever need to fix that pump, I will take it to Cummins and ask for a rebuild kit, which should have the correct spring, based on the pump part#. Maybe just seals, dunno yet. But in any case, I'm hoping my spare pump is a large bore pump and I can just put the 15psi spring in it.
#17
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