Answer :
In a modern common rail diesel (DI) direct injection system, the fuel pressure is typically measured in pounds per square inch (psi). The correct answer from the given options is 26,000 psi.
The common rail system utilizes a high-pressure fuel pump to deliver fuel to a common rail, which then supplies the fuel injectors with pressurized fuel. This high pressure allows for better atomization of the fuel, resulting in improved combustion and efficiency.
The precise control of fuel pressure in a common rail system is crucial for optimal engine performance and emissions reduction. With a fuel pressure of 26,000 psi, the DI system can deliver the necessary fuel volume and pressure to ensure proper engine operation.
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