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After changing the filters on both my 2001 F115s, the RPMs have dropped to 3600. Is there something that needs to be done to bleed the system of air? I have checked the pressure of the fuel rail without starting and it is about 40 psi by turning the key on. It gradually reduces around 4-5 psi after a few mins. When I bleed it, mostly air comes out and only a little fuel. Not sure if this is normal. At this time, I have not checked the pressure with the motor running. What should the pressure be while running? Thanks for the help in advance.
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