2000 AUDI A4 Fuel Supply System Front Wheel Drive 1.8T And 2.8 Workshop Manual

20-29


Repair Manual, Fuel Injection & Ignition, Repair
Group 24 11 -
Nut M4
1.5 Nm
- Install toothed washer beneath
12 -
Nut M5
13 -
Fuel supply unit Removing and installing Page 20
-40
- Electrically check fuel pump Page 20
-
31

- Check the residual pressure14 -
Fuel strainer
Connected to fuel supply unitCan not be individually replaced
- Clean if dirty
15 -
Surge housing lower section Mounted in fuel tankCan not be removedDisconnecting: press unlatching buttons on
connector piece
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20-30


16 -
Sender for fuel gauge -G
Float is cube shapedChecking Page 20
-48
Removing and installing Page 20
-50
17 -
Return line
Installed inside cover flange
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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20-31

Fuel pump, electrical checking


Vehicles with front wheel drive and 1.8 ltr.
turbo or 2.8 ltr. engine

Required special tools, testing equipment
and auxiliary equipment

VAG1348/3A Remote control using
VAG1348/3-2 adaptor cable
Fluke 83 multimeter
VW 1594 Adaptor kit
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g (vehicles with front wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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Checking requirements

Battery Voltage 12 Volts minimum

Fuse 28 OK

Relay 6 in Fuse/Relay panel OKFuel filter OK Ignition switched OFF.
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g (vehicles with front wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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e=re
pair&id=AUDI.B5.GE04.20.2

20-33

Test sequence

- Open fuse box cover on left side of instrument
panel.

- Pull fuse 28 from fuse holder (left row, 5Th fuse
from top)

Note:
The fuel pump runs very quietly. Avoid ambient background noise as
much as possible during fuel pump checks.
If running noise not audible - Connect VAG1348/3A remote control on right side of fuse holder 28
using VAG1348/3-2 adaptor wire -arrow-.
- Connect test lead to Battery +.
- Press remote control switch.
Fuel pump running noise must be audible
- Remove connector flange cover under luggage compartment trim.

- Unlatch and disconnect 4-pin harness connector -1-.
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ge 29 of 49 Fuel su
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ly system, servicin
g (vehicles with front wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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e=re
pair&id=AUDI.B5.GE04.20.2

20-34


If specified value obtained but no running noise audible from pump
WARNING!
Fuel system is under pressure! Before opening, place clean cloths
around the connections to be opened. Carefully loosen the
connections to relieve pressure. - Switch Fluke 83 multimeter to 20 Volt range and connect to terminal 1
(green/yellow) and 4 (brown) of harness connector using jumper wires
from VW 1594 Adaptor kit.
- Press remote control switch continuously while reading Voltage.
Specified value: approx. Battery Voltage.
- Remove cover flange as follows:

- Mark supply line -2- and return line -3- and remove from cover flange.
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gine
)
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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20-35


- Unscrew union nut using 3217 wrench.
- Remove cover flange and sealing ring from fuel tank opening.

If wiring OK; fuel pump is faulty - Check wiring for continuity between flange and fuel pump.
- Replace fuel supply unit Page 20
-40
- Re-install cover flange Page 20
-44
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ge 31 of 49 Fuel su
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ly system, servicin
g (vehicles with front wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.2

20-36

Fuel pump delivery volume, checking


Vehicles with front wheel drive and 1.8 ltr.
turbo or 2.8 ltr. engine

Required special tools, testing equipment
and auxiliary equipment

VAG1348/3A Remote control using
VAG1348/3-2 adaptor cable
Calibrated measuring container

Checking requirements
Battery Voltage: 12 Volts minimum
Fuel filter OK
Ignition switched OFF.
Pa
ge 32 of 49 Fuel su
pp
ly system, servicin
g (vehicles with front wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.2