CUMMINS FUEL RAIL PRESSURE SENSOR

Beginning with the 2003 model years, Heavy Duty Ram models were given a big upgrade that is still in effect today, with the available Common Rail equipped Cummins. What is a Common Rail you may ask? In short, its a super high pressure fuel delivery system built by Bosch that features a high pressure CP3 injection pump feeding a single fuel line that enters into a fuel rail located onto the drivers side of the engine. This "common rail" then has six injector lines that are responsible to individually feed each injector. Besides injector lines, this rail also features a return line and pressure relief valve responsible for relieving excessive pressure, and a rail pressure sensor that tells the ECM (on board computer) what pressure is at the rail, which can be as high as 30,000 psi and as low as roughly 4,000 psi.

Because of this extremely high pressure, coupled with the fact that it must deviate so much in order to create proper combustion in the cylinders for optimum performance, the performance of the fuel rail pressure sensor is critical. If this sensor is incorrectly calibrated even by 1,000 psi, it can deliver a hard start, rough idle, or just a truck that is not running optimally. In a worst case scenario, it can easily be the contributing factor to a truck that simply won't start at all. If you're experiencing issues with your Cummins that you believe are due to gremlins in your fuel system, but not sure where to start diagnosing, you need to read our thorough, step-by-step tutorial by CLICKING HERE.

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