Fuel System, Basic Function - GF47.00-P-9900A
MODEL ALL (CAR)
Schematic diagram (low- and high-pressure fuel pump), engine 608
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 comprises the fuel supply system (low-pressure fuel circuit) and 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 comprises the high-pressure fuel circuit and injection control system. 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. The fuel injectors inject as much fuel as is needed directly into the combustion chamber, where the optimum fuel-air mixture can then be formed.
Key components of the fuel supply (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 the mixture formation system (high-pressure fuel circuit):
- Fuel system high pressure pump
- Fuel distributor
- Fuel injectors
- Fuel distributor fuel pressure sensor
- Quantity control valve
- Pressure limiting valve
- Fuel high-pressure lines
| Additional basic functions | |||
| Mixture formation, basic function | Engine all (CAR) | GF07.00-P-1000A | |
| Fuel supply, basic function | Engine all (CAR) | GF47.00-P-1003A | |
| Collection of gases when refueling, basic function | Engine 260, 282 | GF47.10-P-1002A | |
| Fuel preheating, basic function | Engine 608 | GF47.21-P-1000A | |
| Purging, basic function | Engine 260, 282 | GF47.30-P-1000A |