Fuel System, Basic Function - GF47.00-P-9900A
Engine All (4xWD)
Engine All (CAR)
Sample 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 (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 supplies the fuel from the fuel tank (5) to the highpressure fuel pump (9).
The mixture formation system consists of the high-pressure fuel circuit and the injection control. The function of the mixture formation is to compress the fuel via the high-pressure fuel pump (9), store the fuel pressure in the fuel distributor (2) and make this available to the fuel injectors (4) depending on the operating status. To form an optimal fuel/air mixture, the fuel injectors (4) inject the fuel directly into the combustion chamber in a needs-based manner.
Key components of fuel supply system (low-pressure fuel circuit):
- Fuel tank (5)
- Fuel delivery module (6)
- Fuel filter module (7) (for diesel engines)
- Fuel pump control unit
- Fuel preheating control unit (diesel engines)
- Fuel pressure and temperature sensor (8)
Key components of mixture formation system (high-pressure fuel circuit):
- High-pressure fuel pump (9)
- Fuel distributor (2)
- Fuel injectors (4)
- Fuel distributor pressure sensor (3)
- Quantity control valve (10)
- Pressure limiting valve (1)
- Fuel high-pressure lines (C)
| 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 All models (cars) Engine 656 All models (off-road vehicles) |
GF47.21-P-1000A | |
| Purging, basic function | Engine 139, 176, 177, 254, 256, 260, 264, 274, 279, 282 | GF47.30-P-1000A |