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Re: P120F Fuel Pressure Regulator Excessive Variation
Posted to HD/Fleet Forum on 2/16/2019 1 Reply

I do know that the low pressure fuel system will recycle the fuel return flow from the injectors and high pressure pump, depending on temperature, so maybe that's where the low vacuum reading is coming from; the pump's just recycling. I guess it's possible tha... Login to read more.

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