LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

The Engine Control Module (ECM) enables the fuel pump relay when the ignition switch is turned on. The ECM continues to enable the fuel pump relay as long as crankshaft reference pulses are detected. The ECM disables the fuel pump relay within 2 s if crankshaft reference pulses cease to be detected and the ignition remains ON.

The fuel tank stores the fuel supply. An electric fuel pump draws fuel from the fuel tank sending unit. Fuel flows to the fuel filter/heater housing, which combines the water separator, water in fuel sensor, fuel heater element with temperature sensor, and a fuel filter element. The fuel is then delivered to the high-pressure pump.

The fuel return system uses the unused return fuel to cool and lubricate the fuel injectors and fuel injection pump. If the high side fuel pressure becomes excessive, the fuel pressure regulator releases the fuel into the fuel return system. The returned fuel travels through the fuel lines to the fuel tank.

scientia non olet · About LEMON Manuals