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How much time does it take to go from 40 psi to 0? What is the loss of psi every thirty seconds? You might have a leak some where? If you have a leak I would first check at the fuel pressure regulator. Next check for wetness around the lines. I would also make sure the shredder valve is secure. You can actually take the valve out of the line and clean it. I think it uses a 11/32 wrench. What kind of gauge do you have?
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