Class 4 (4th Engineer) MEKG 📅 Aug 2025

Exam Question

Sketch and describe a fuel system diagram for a 2 stroke Marine diesel engine from storage / service tank to fuel injectors. Show the various components and fittings which are provided in the circuit. What is the purpose of mixing columns & autodeaerating valve? (16)

Reference Answer

### Fuel Oil System for a 2-Stroke Marine Diesel Engine
The primary objective of the fuel oil system is to supply clean fuel to the engine's injectors at the correct pressure, temperature, and viscosity, ensuring efficient combustion. The system described is for Heavy Fuel Oil (HFO), which requires heating and purification.
### System Description and Fuel Flow Path
The fuel oil travels from the Service Tank to the Fuel Injectors through a pressurized circuit, often called a booster unit or fuel oil supply module.

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