Fuel System, Basic Function - GF47.00-P-9900A
Engine all (4xWD)
Engine all (CAR)
Schematic diagram of low-pressure and high-pressure fuel circuit
Overview
This document contains information on:
- General
- Function requirements
- Function General
The fuel system provides the combustion engine with fuel in all operating ranges by means of the fuel supply system and mixture formation system.
Function requirements
- Engine management ON (terminal 87M)
- Ignition ON (circuit 15)
Function
The fuel system consists of the fuel supply system (low-pressure fuel circuit) and the mixture formation system (high-pressure fuel circuit). The fuel supply system pumps the fuel from the fuel tank to the high-pressure fuel pump.
The mixture formation system consists of the high-pressure fuel circuit and the injection control. The mixture formation system compresses the fuel via the high-pressure fuel pump, stores the fuel pressure in the fuel distributor and, depending on the operating condition, supplies the fuel to the fuel injectors. To form an optimum fuel/air mixture, the fuel injectors inject as much fuel as is needed directly into the combustion chamber.
Key components of fuel supply system (low-pressure fuel circuit):
- Fuel tank
- Fuel feed module
- Fuel filter module (diesel engines)
- Fuel pump control unit
- Fuel preheating control unit (diesel engines)
- Fuel pressure and temperature sensor
Key components of mixture formation system (high-pressure fuel circuit):
- High-pressure fuel pump
- Fuel distributor
- Fuel injectors
- Fuel distributor fuel pressure sensor
- Quantity control valve
- Pressure limiting valve
- High-pressure fuel lines
| Additional basic functions | |||
| Mixture formation, basic function | GF07.00-P-1000A | ||
| Fuel supply, basic function | GF47.00-P-1003A | ||
| Collection of gases when refueling, basic function | Engine 139, 176, 177, 254, 256, 260, 264, 274, 279, 282 | GF47.10-P-1002A | |
| Fuel preheating, basic function | Engine 608, 654, 656 Engine 656 | GF47.21-P-1000A | |
| Purging, basic function | Engine 139, 176, 177, 254, 256, 260, 264, 274, 279, 282 | GF47.30-P-1000A |