Class 4 (4th Engineer) MEKM 📅 Jan 2026

Exam Question

(a) Sketch and describe a fuel oil system of a large diesel engine, from settling tanks to main engine fuel injectors. (10)

(b) Also comment on the importance of

(i) Heating arrangement with temperature control (3)

(ii) Prevention of air lock in the system (3)

Reference Answer

### (a) Fuel Oil System for a Large Diesel Engine
The fuel oil system for a large, slow-speed marine diesel engine operating on Heavy Fuel Oil (HFO) is a comprehensive circuit designed to treat, heat, pressurize, and inject fuel for efficient combustion. The system can be traced from the storage tanks to the engine's injectors.
**System Components and Fuel Path:**
1. **Settling Tanks (2 Nos.):**

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