Fuel System Description: Notes

Fig 1: Identifying Fuel System Components

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	Fuel Injection Pump
2	Fuel Pressure Regulator 1 Valve
3	Fuel Rail
4	Fuel Rail Pressure Sensor
5	Fuel Injector
6	Fuel Pressure Regulator 2 Valve
7	Damper Volume
8	Fuel Tank
9	Fuel Pump
10	Fuel Filter Assembly

The fuel pump module (9), located in the right side of the fuel tank, supplies fuel through the fuel feed pipe to the high pressure mechanical fuel injection pump (1). The mechanical fuel injection pump (1) is located on the lower left side of the engine. Fuel is drawn through the fuel filter/heater element housing (10), which combines a water separator, a fuel heater element, and a filter element. The mechanical fuel injection pump output is controlled by the engine control module (ECM), and provides fuel at the pressure needed by the fuel injectors (5). The fuel injectors supply fuel directly to the combustion chambers of the engine. A separate pipe returns unused fuel through to the fuel tank. The mechanical fuel injection pump, fuel rail pressure, fuel injection timing, and injection duration are controlled by the ECM.