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Home >> GMC >> 2004 >> Sierra 2500 HD, 2D Pickup, 6.6 1, 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 6.6L (Lb7) (Introduction) >> Description and Operation >> Fuel System Description >> Fuel System Overview

Fuel System Overview

Fig 1: Fuel System Overview
GM743365Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Fuel Rail
2 Fuel Junction Block
3 Fuel Injector
4 Fuel System Cooler
5 Fuel Tank
6 Fuel Injection Control Module
7 Fuel Filter
8 First Start Fuel Bleeder Valve
9 Fuel Injection Pump

The fuel tank (5) stores the fuel supply. A mechanical fuel injection pump (10), located below the engine intake, draws fuel through the fuel injector control module (6) and the fuel filter (7). The fuel is used as a coolant for the fuel injector control module. The fuel 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 (4) and to the fuel tank.