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Regarding the statements about the fuel return in a CRD system:
1. High fuel temperatures can lead to flocculation: This statement is accurate. Flocculation refers to the clumping together of particles in a liquid. In a CRD (Common Rail Diesel) system, high fuel temperatures can cause the fuel to break down and form clumps, which can lead to clogging and damage to the system.
2. The fuel is cooled and returned to the fuel tank: This statement is correct. In a CRD system, after the fuel is used in the engine, it is cooled to maintain its properties and then returned to the fuel tank to be reused. Cooling the fuel helps in maintaining its viscosity (thickness) and lubricating qualities.
3. The high pressure pump output is greater than the maximum flow of the injectors: This statement is true. In a CRD system, the high pressure pump delivers fuel to the injectors at a pressure higher than what the injectors can handle. This ensures that the injectors receive fuel at a sufficient pressure for efficient combustion in the engine.
4. The fuel is cooled to maintain good viscosity and lubricating qualities: This statement is accurate. Cooling the fuel in a CRD system helps to regulate its viscosity, ensuring that it flows smoothly through the system, and maintains its lubricating properties to prevent wear and tear on the engine components.
I hope this explanation helps clarify the statements about fuel return in a CRD system. Let me know if you have any further questions!
