1999 AUDI A4 fuel pump

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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**)
Voltage at fuel pump with engine not running but pump running
(approx. 2 Volt less than battery voltage).
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p://127.0.0.1:8080/audi/servlet/Dis
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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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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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20-121


Installing
Installation is in reverse order of removal, but do the following:
Note:
Secure all hose connections with hose clamps identical to factory-installed
clamps.
Parts catalog. - Insert wrench 3307 through fuel tank opening and place on inner part
of fuel accumulator housing.
-
Turn wrench 3307 approx. 15 to the left to stop and remove fuel
pump with inner part of fuel accumulator housing. - Install inner fuel accumulator housing, fuel supply hose and fuel pump
flange in fuel tank.
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p://127.0.0.1:8080/audi/servlet/Dis
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20-122


Note:
The fuel accumulator housing is shown in the illustration without fuel tank. - Install outer fuel accumulator housing in fuel tank by aligning notch -1-
on inner accumulator housing with notch -2- at outer accumulator
housing.
The inner accumulator housing can be pushed down noticeably.
- Apply wrench 3307 and turn inner fuel accumulator housing with pump
approx. 15 to the right to stop. Notch -1- is then aligned with marking
-3- (bayonet-type connection).

Note:
Lubricate O-rings with fuel before installing. - When installing, turn flange to the right (direction of arrow).
- Connect fuel return line on the inside of flange.
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20-126

Test sequence

- Remove luggage compartment liner.

- Remove cover for fuel pump.

- Unclip 4-pin connector and disconnect.

If the fuel tank contains fuel, the measured value must be between the
specified values for full and empty. - Measure resistance at both terminals -2- and -3- at fuel pump flangeSender
Tank full
Tank empty
Sender for fuel gauge -G
40
280
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11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.4