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Q: fuel press at idle is 45psi when i accelerate it drops to 15psi till i let off on 1995 Jeep Grand Cherokee

it jumps back to 45psi till i hit the gas again. in the morning time when it has sat all night it runs great as soon as it warms up it starts all over again. please help
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Fuel pump, fuel filter OR the fuel pressure regulator, which may or may not be part of the pump module!
I think on this year model the regulator is fuel rail mounted.
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