Table of Contents

General Overview

This manual covers essential topics such as the general structure and function of the system, testing and adjustments, disassembly and assembly procedures, maintenance standards, as well as repair and replacement guidelines.

• 01 GENERAL
• 11 STRUCTURE AND FUNCTION
• 12 TESTING AND ADJUSTING
• 13 DISASSEMBLY AND ASSEMBLY
• 14 MAINTENANCE STANDARD
• 15 REPAIR AND REPLACEMENT

General Description

The fuel system is a crucial component consisting primarily of the following parts:

Key Features

• Fuel Tank: Stores fuel before it is pumped to the engine.
• Feed Pump: Transfers fuel from the tank to the injection pump.
• Fuel Filter: Cleans the fuel of contaminants such as dirt and water.
• Fuel Injection Pump: Compresses the fuel for delivery to the engine.
• Fuel Injection Nozzles: Inject fuel into the engine cylinders.
• Governor: Integrated with the fuel injection pump to control engine speed.

Benefits

• Ensures clean and efficient fuel delivery to the engine.
• Supports easy starting by supplying fuel to the thermostart (40105, S4O105).
• Enhances engine performance by precise fuel injection timing.

Fuel Circulation Process

• Fuel is drawn from the tank and passes through the feed pump and filter, removing larger impurities.
• The injection pump pressurizes the fuel for accurate injection into each cylinder.
• Excess fuel returns to the tank via spill pipes, ensuring a closed-loop system.

Visual Reference: View the system structure in the diagram below:

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