Fuel System Description: Notes

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Fig 1: Fuel System Overview

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	Fuel Rail
2	Fuel Pressure Sensor
3	Fuel Injectors
4	Fuel Return Junction Block
5	Fuel Cooler
6	Fuel Tank
7	Fuel Filter
8	First Start Fuel Bleeder Valve
9	Fuel Injection Pump

The fuel tank (6) stores the fuel supply. A mechanical fuel injection pump (9), located below the engine intake, includes the fuel supply pump and the high-pressure pump. Fuel is drawn through the fuel filter/heater element housing (7), which combines a water separator, a hand prime pump, a fuel heater element and a filter element. An integrated hand prime pump is used to prime the fuel system after changing the fuel filter or servicing the fuel system. The mechanical fuel injection pump output is controlled by the ECM, and provides fuel at the pressure needed by the fuel injectors (3). The fuel injectors supply fuel directly to the combustion chambers of the engine. A separate pipe returns unused fuel through a fuel cooler (5) to the fuel tank.