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The regulator is fine, but the engine does run much better with the vacuum line disconnected from the regulator and capped. Fuel is not getting into the intake and the oil smells fine. It must be the check valve. That will not hurt my mileage will it? I have to let the pump run for a few seconds to start the truck. It sound weak, but the fuel rail is at 55 lbs. I will check the resistance on the temp sensors again and see how they sweep compared to new ones.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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