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The pressure should stay at 28PSI after the 2-3 second system priming. The problem is almost surely the one way valve integral to the fuel pump. Its part of the out flow nipple and can be unscrewed for replacement(assuming you can find a good replacement.) The pressure regulator at the fuel rail is most likely good because its restricting fuel flow to maintain the pressure while the pump is running. Although I have never seen such a thing, perhaps there is a one way check valve you could install just a few inches forward on the fuel pump outlet side
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