Fuel System, Basic Function - GF47.00-S-9900A
Engine All (Light transporter)
Schematic diagram of low-pressure fuel circuit 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 (circuit 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 (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
| Wiring diagrams | |||
| Survey of wiring diagrams of fuel system | Engine 200, 608 in model 420 | PE47.00-S-1100VRA | |
| Additional basic functions | |||
| Mixture formation, basic function | GF07.00-S-1000A | ||
| Fuel supply, basic function | GF47.00-S-1003A | ||
| Fuel preheating, basic function | Engine 608, 654 | GF47.21-S-1000A | |
| Purging, basic function | Engine 200 | GF47.30-S-1000A |