![]() The Cummins diesel engine is unique in the diesel truck world, as it is uses an inline design and only features 6 cylinders. Ford’s Powerstroke, and Chevy’s Duramax engine both use tradition V-shaped engines and have 8-cylinders instead of 6. Accelerator Pedal Position Sensor Failure.4 Most Common Cummins 24v 5.9L Engine Problems Despite the smaller powerplant, these engines are still capable of producing significant power, and tend to be more reliable than its competitors. The Cummins 24v fuel injection system has three primary components: a lift pump, an injection pump, and injectors. The injection pump, also known as a high-pressure fuel pump, is responsible for pressurizing the fuel which gets sent to the injectors and into the cylinders. Injection pumps will pressurize fuel anywhere from 15,000 to 30,000 psi, which is extremely high. Lift pumps are responsible for pumping fuel from the gas tank to the injection pump. Without a lift pump, the injection pump has to pull the fuel all the way from the gas tank to the fuel injectors. This creates an immense amount of stress on the system and ultimately crushes injection pump reliability. In order to have a reliable fuel injection system, the Cummins 5.9 comes from the factory with an OEM lift pump. However, 1998 to 2004 model year 24v’s experience common lift pump failure. These early year 24v’s had their lift pumps attached to the engine block.
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