I picked up a used Graco 395 sprayer and to test it quickly, I just used water to pressurize it. The motor kept running to hold pressure and the guns leaked at the ends. Is that typical? Does a pump need the viscosity of paint to hold pressure and make a good seal? Same with the carbide ball in a gun?
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I picked up a titan 440i sprayer off of craigs list for $125. It was my first sprayer and the best $125 I ever spent! That thing held pressure fine with water in it, so I would agree with Workaholic - you need a repack.