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It is preset at the factory.............why do you need to change it? Please see the attached link for that information. It is set for 100 psi and you can hook up a line and use a bucket or some other source of water that is close by. Other than that, I need you to describe the actual installed specs on this. That may change things. All follow ups are included in our fee. http://www.pumpagents.com/ShurfloPumps/8000-713-238.html
Please see the attached link as well........... http://legacy.shurflo.com/pdf/rv/911_trouble_shooting/new/911-396-K.pdf
That is the bulletin you asked for............let me know if you need more later.
And this pump is self-priming up to 11 ft of lift.
Are we all good here or do you still need some assistance with this issue?