1998 AUDI A4 Fuel Supply System Biturbo 2.8 Workshop Manual

20-115


If wiring and connections are OK: - Check electrical connections between flange and fuel pump, check for
continuity.
- Fuel pump is faulty; replace pump Page 20
-118
.
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20-116

Fuel pump delivery volume, checking


Vehicles with 2.7 ltr. turbo engine

Special tools needed:
Test conditions:
Test sequence
Remote switch VAG1348/3A with adapter wire VAG1348/3-2Measuring cupBattery voltage at least 12 V Fuel filter OK Ignition switched off.
- Open fuse panel cover at left side of instrument panel.
- Remove fuse 28 from fuse panel (left row, fifth. large fuse from the
top).

- Connect remote switch VAG1348/3A with adapter wire VAG1348/3-2 to
right terminal of fuse socket 28 -arrow-.
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20-117

- Connect alligator clip to battery (+) .

- Remove fuel filler cap

- Remove engine cover

WARNING!

Fire hazard! Remove everything from the area
that could ignite fuel or fuel vapor. fuel
system is under pressure. Cover connection
with rag and carefully release pressure by
slowly opening the connection.

- Disconnect fuel return line from line connection at fuel distributor.
- Connect test hose -arrow- at fuel distributor line and place other hose
end into measuring cup.
- Operate remote switch for 15 seconds (press button continuously).

*) Volume of fuel delivered in cm
3/15 s - Compare collected fuel with specified value.
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**)
Voltage at fuel pump with engine not running but pump running
(approx. 2 Volt less than battery voltage).
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20-118

Fuel pump, removing and installing


Vehicles with 2.7 ltr. turbo engine
Observe all safety precautions Page 20-1 .
Observe rules of cleanliness Page 20
-4 .

Special tools needed:
Wrench 3217 for threaded cap nut

Wrench 3307 for fuel pump
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20-119

Removing

- Obtain radio code for radio with anti-theft
coding.

- Switch off ignition and disconnect battery ground
(GND) cable.

- Briefly open fuel filler cap and then close it
again.

- Empty fuel tank if necessary using fuel
evacuator unit VAG1433 A.


Front wheel drive Page 20
-18
.


All wheel drive Page 20
-66
.

Note:

The fuel tank may not be filled more than
1/3.

- Remove luggage compartment liner.

- Remove cover for fuel pump flange.

WARNING!
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Fire hazard! Remove everything from the area
that could ignite fuel or fuel vapor. fuel
system is under pressure. Cover connection
with rag and carefully release pressure by
slowly opening the connection.
Pa
ge 15 of 25 Fuel su
pp
ly system, servicin
g (vehicles with 2.7 ltr. turbo en
gine
)
11/19/2002 htt
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pair&id=AUDI.B5.GE04.20.4

20-120


- Mark fuel return line -2- and fuel supply line -3- and disconnect from
flange.
- Unclip 4-pin connector -1- and disconnect connector.

- Remove threaded cap nut with wrench 3217.
- Remove fuel pump flange and seal from fuel tank opening.
- On inside of flange disconnect connector for fuel gauge sender.
- Disconnect fuel return line on inside of flange (press release tabs).
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pair&id=AUDI.B5.GE04.20.4