General Description - Isuzu AA-6HK1T Workshop Manual

6C–2 ENGINE FUEL
Fuel System Operation
The fuel injection pump is driven by the crankshaft. The
fuel injection pump drives the fuel feed pump.
The fuel feed pump draws fuel from the fuel tank. The
fuel is delivered to the injection pump through the
fuel/water separator and the secondary fuel filter.
The governor regulates the flow of fuel to the delivery
valves.
The plunger in the injection pump delivers fuel at high
pressure through the delivery valves to the individual
fuel injectors at precise intervals.
The pressure generated by the fuel in the fuel injector
forces open a needle valve. Fuel is injected from the
injection nozzle holes into the cylinder as a very fine
spray.
Excess fuel is returned to the fuel tank through the fuel
return line.

General Description

When working on the fuel system –
• Disconnect the negative battery cable.
• Have a dry chemical (Class B) fire extinguisher
where it can be reached quickly.
• Release the fuel line pressure before servicing
system components.
• Carefully read and understand the appropriate
instructions.