Engine Maintenance 9-12
ENGINE FUEL SYSTEM
The components of a typical fuel system include:
1. Fuel tank
2. Prefilter or fuel strainer
3. Fuel filter (or Primary and Secondary Fuel Filters)
4. Water separator
5. Hand fuel pump
6. Transfer pump (or electric fuel pump)
7. Injection pump
8. Injection nozzles
The hand fuel pump is used to manually draw fuel from the tank up to the transfer pump if the unit should run out of fuel. Fuel
is drawn from the fuel tank through the prefilter by the transfer pump (or electric fuel pump). The transfer pump (or electric fuel
pump) delivers fuel to the water separator and fuel filter. Filtered fuel passes through a line from the outlet fitting on the filter
base to the injection pump.
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