How are you pressurizing the system? I'm not familiar with the how the FSM says to pressurize the system. I prime the system mostly by just turning the key to the on position which will cut the fuel pump on for a couple of seconds or by using the diagnostic box. How fast is the pressure dropping? Is this a stock fuel system? Mine did this when I had an injector that was stuck open. I would prime the system, and after a minute or two it would be back at 0psi
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