The diesel engine shown in the illustration...

The diesel engine shown in the illustration has the highest fuel pressure developed in the part labeled __________. Illustration MO-0003

🔍 Key Concepts

• Fuel injection system on a large slow-speed diesel (difference between low-pressure supply and high-pressure injection side) • Typical pressure levels: fuel transfer/booster pumps vs injection pump and injector/nozzle • Flow path from the day tank to the cylinder: where is fuel last boosted to very high pressure before entering the combustion space

💭 Think About

• Trace the fuel’s path on the illustration from the supply/return piping up to the cylinder head and ask: where does the fuel have to be at its highest pressure in order to overcome cylinder compression and achieve good atomization? • Look at what each labeled part (E, X, Y, Z) is connected to: which one is clearly part of the high‑pressure side of the fuel system rather than the low‑pressure supply/return or non-fuel components? • Consider which components normally run at only a few bar versus hundreds of bar in a marine diesel engine

✅ Before You Answer

• Identify which labels are actually on fuel system components (pump, injector/nozzle, high‑pressure line) and eliminate any that are clearly part of the mechanical drive or structure (e.g., guides, rods, or frame). • Verify which labeled point is closest to the combustion chamber in the fuel path – this is where the fuel pressure must be highest. • Remember that supply/return lines and service pumps operate at relatively low pressure compared to the injection equipment – do not pick a point located only in those low‑pressure lines.

🔍 Key Concepts

💭 Think About

✅ Before You Answer