gf4700p9900a

Fuel system, basic function

Type gf · topic 47.00 · version 0103 · 2020-09-10

Applies to: Engine all (CAR)

Where it sits

Function group 1 Engine › 47 Fuel system, powertrain energy supply › 47.00 General — Series 900 (models 9**) · Series 902 (models 9**) · Series 904 (models 918, 919, 924, 925, 938, 943, 957) · Series 906 (models 917, 918, 924, 953)

EinPAS 16 Fuel/power supply to engine › 16.10 Fuel supply › 16.10.1 Basic information — Series 900 (models 9**) · Series 902 (models 9**) · Series 904 (models 918, 919, 924, 925, 938, 943, 957) · Series 906 (models 917, 918, 924, 953)

Also applies to engines/gearboxes: 139 ***, 254 ***, 256 ***, 272 ***, 276 ***, 282 ***, 457 9**, 541 9**, 542 9**, 608 ***, 700 4**, 700 420, 700 421, 700 422, 700 423, 715 3**, 715 5**, 722 6**, 722 9**, 724 ***, 724 0**, 724 033, 724 044, 724 045, 724 1**, 724 103, 724 114, 724 115, 724 120, 725 ***, 725 0**, 725 035, 725 037, 725 038, 725 085, 725 1**, 739 390, 739 391, 739 395, 739 396, 739 397, 739 398, 739 399, 740 698, 743 3**, 743 4**, 743 498, 746 971, 924 9**, 924 910, 925 9**, 926 9**

GF47.00-P-9900A

Fuel system, basic function

10.09.2020

Engine

all (CAR)

Fuel system, basic function

P47.00-2271-79

Schematic diagram of low-pressure and high-pressure fuel circuit

1

Pressure limiting valve

8

Fuel pressure and temperature sensor

2

Fuel distributor

9

Fuel high-pressure pump

3

Fuel distributor fuel pressure sensor

10

Quantity control valve

4

Fuel injector

A

Fuel feed line for fuel filter module (low-pressure line)

5

Fuel tank

B

Fuel feed line for high-pressure fuel pump (low-pressure line)

6

Fuel feed module

C

High-pressure fuel lines

7

Fuel filter module

D

Fuel return lines

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):

Fuel high-pressure 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

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 139, 176, 177, 254, 256, 260, 264, 279, 282
with code 494 (US version)
Engine 139, 176, 177, 254, 256, 260, 264, 282
with code 494 (US version)

GF47.10-P-1002A

Fuel preheating, basic function

Engine 608, 654, 656

GF47.21-P-1000A

Purging, basic function

Engine 139, 176, 177, 254, 256, 260, 264, 279, 282

GF47.30-P-1000A

Referenced documents