AUDI A4 1998 B5 / 1.G Quattro Fuel Syst

20-82

Fuel pump, electrical checking


Vehicles with all 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 (or equivalent)
VW 1594A adaptor kit
Pa
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ly system, servicin
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gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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20-83

Test requirements

Battery Voltage: 12 Volts minimum

Fuse 28 OK

Relay 6 in Fuse / Relay panel OK Fuel filter OK Ignition switched OFF.
Pa
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g (vehicles with all wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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e=re
pair&id=AUDI.B5.GE04.20.3

20-84

Test sequence

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

- Remove fuse 28 from fuse panel

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 pump running noise is not audible - Connect remote control VAG1348/3A on right side of fuse socket 28
using VAG1348/3-2 adaptor wire -arrow-.
- Connect clamp to Battery +.
- Press remote control switch.
Fuel pump when running must be audible.
- Remove connector flange cover under luggage compartment trim.

- Unlatch and disconnect 4-pin harness connector -1-.
Pa
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g (vehicles with all wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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e=re
pair&id=AUDI.B5.GE04.20.3

20-85


If specified value obtained but no audible sound 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
- Connect multimeter between terminals 1 (green/yellow) and 4 (brown)
of harness connector using jumper wires from VW 1594 adaptor kit.
- Press remote control switch continuously and read Voltage.

Specification: approx. Battery Voltage.
- Remove cover flange as follows

- Mark return line -2- and supply line -3- and remove from cover flange.
Pa
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g (vehicles with all wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.3

20-86


- Unscrew union nut using wrench 3217.
- Take cover flange and sealing ring out of the fuel tank opening.

If wiring OK - Check wiring between flange and fuel pump for continuity.
- Fuel pump faulty, replace Page 20
-91
.
- Fuel supply unit, installing Page 20
-96
.
Pa
ge 35 of 55 Fuel su
pp
ly system, servicin
g (vehicles with all wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.3

20-87

Fuel pump delivery volume, checking


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

Required special tools, testing equipment
and auxiliary equipment

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

Test requirements
Battery Voltage: 12 Volts minimum
Fuel filter OK
Ignition switched OFF.
Pa
ge 36 of 55 Fuel su
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g (vehicles with all wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.3

20-88

Test sequence

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

- Remove fuse 28 from fuse panel (left row, 5Th
fuse from top)

- Connect VAG1348/3A remote control to right terminal of fuse 28 using
VAG1348/3-2 adaptor cable -arrow-.
- Connect tester clamp to Battery +.
- Remove fuel filler cap.
- Remove engine cover.
Pa
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gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.3

20-89

WARNING!

Fuel system is under pressure! Before
opening, place clean cloths around the
connections to be opened. Carefully loosen
the connections to relieve pressure.

Vehicles with 1.8 ltr. turbo engine

Vehicles with 2.8 ltr. engine - Disconnect fuel return hose from connection on fuel distributor line.
- Connect auxiliary hose -arrow- to distributor line and place in a
measuring container.

- Disconnect fuel return hose from the hose connection on the fuel
distributor line.
- Connect auxiliary hose -arrow- to distributor line and place in a
measuring container.
Pa
ge 38 of 55 Fuel su
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ly system, servicin
g (vehicles with all wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.3

20-90

All vehicles

- Operate remote control for 15 seconds.

Keep button depressed continuously

*) Minimum supply quantity cm
3/15 s
**)
Voltage across fuel pump with engine off and pump running (approx. 2
Volts less than Battery Voltage). - Compare delivered quantity to specified value.
Pa
ge 39 of 55 Fuel su
pp
ly system, servicin
g (vehicles with all wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.3

20-91

Fuel supply unit, removing and
installing


Vehicles with all wheel drive and 1.8 ltr. turbo
or 2.8 ltr. engine
Observe Safety measures Page 20
-1 .
Observe Rules of cleanliness Page 20
-4 .

Required special tools, testing equipment
and auxiliary equipment

FM 3000 fuel cart (or equivalent)
3217 Union nut wrench
3307 fuel pump wrench
VAG1275 Hose clamp pliers
Pa
ge 40 of 55 Fuel su
pp
ly system, servicin
g (vehicles with all wheel drive and 1.8 ltr. turbo or 2.8 ltr. en
gine
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.3