Low Fuel Rail Pressure - 2012 RAM 2500

[Martin2779]

I have a 2012 RAM 2500, getting around 4600 psi during idle.

Between 7000 and 11000 are running down the highway.

Fresh fuel filter, new fuel rail relief plug.

I have a FASS 165 on the way.

Any suggestions on what else to check?

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[cumminsdieselfreak]

Why do you say it's low, those numbers are good for the most part.


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[Martin2779]

Truck doesn't run or accelerate like it use to and the rail pressure is lower than a friends identical truck.

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[cumminsdieselfreak]

Truck doesn't run or accelerate like it use to and the rail pressure is lower than a friends identical truck.

Your idle psi is perfect and 9-11k cruising on interstate is excellent.

Factory fuel pumps are weak from the factory.


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