AUDI A4 1997 B5 / 1.G AFC Engine Fuel Supply System Components User Guide

20-7

Fuel pump, removing and installing


Observe safety measures page 20
-3

Pay attention to rules of cleanliness page 20
-2 .
Removing and installing sealing flange and fuel
level sensor page 20
-5

WARNING!

Fire hazard. DO NOT smoke or work near
heaters or have anything in the area that can
ignite fuel!

Removing

Installing
Installation is in reverse order of removal.
Note: - Insert fuel pump wrench 3307 through fuel tank opening and position at
inner part of fuel reservoir housing.
-
Turn inner part of reservoir housing about 15 to left as far as stop and
remove fuel pump along with inner part of reservoir housing.
Moisten the flange seal with fuel before installing.
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Flange installation position page 20
-6 .
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20-8

Front-wheel-drive vehicles

- Turn hose -7- and wiring harness -5- into position as shown at upper
left of illustration; when installing flange, turn in direction of arrow as
shown at upper right of illustration.
- Compress clamp -3- with pliers, VAG 1275.
1 - Reservoir housing
2 - Flange
3 - Clamp
4 - Securing bolt
5 - Wiring
6 - Cable strap
7 - Hose
- Install reservoir housing with flange into fuel tank.
Wiring for fuel level sensor must be routed between return line and
fuel tank housing.

- Turn flange to left until arrows (FRONT) are aligned.
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20-9

All wheel-drive-vehicles

- Turn hose -7- and wiring harness -5- into position as shown in upper
left of illustration; when installing flange, turn in direction of arrow as
shown at upper right of illustration.
- Compress clamp -3- with pliers VAG 1275.
1 - Reservoir housing
2 - Flange
3 - Clamp
4 - Securing bolt
5 - Wiring
6 - Cable strap
7 - Hose
- Install reservoir housing with flange into fuel tank.
Wiring for fuel level sensor must be routed between fuel transfer
pump line and fuel tank housing.

- Turn flange to left until arrows (QUATTRO) are aligned.
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20-10

Fuel pump, testing


WARNING!

Fire hazard! DO NOT smoke or work near
heaters or have anything in area that can
ignite fuel!

Checking power supply

Battery fully charged
Fuse 28 OK
Test voltage supply to fuse 28 Repair
Manual, 2.8 Liter V-6 OBD II Fuel Injection
and Ignition, Repair Group 24

Fuel supply OK

- Switch ignition on.
Fuel pump must be heard to run briefly.
(Second person will be required for this if
surrounding noise level is too high).
If fuel pump does NOT run:

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- Remove cover for fuel pump module (under
luggage compartment trim, right rear).

- Disconnect harness connector for fuel pump and
fuel level sensor.
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20-11

- Supply voltage to fuel pump using VAG 1551
scan tool and "Output Diagnostic Test Mode"
function 03.

- Connect multimeter between connector terminal 1 (green wire) and
terminal 4 (brown wire) using adapter cables from VW 1594 connector
test kit.
Specified value: approx. battery positive voltage (B+)
- If specified value is obtained, reconnect harness connector.

If wiring is OK:
Checking fuel delivery - Using ohmmeter, check for continuity between connector (outside of
housing), harness connector and fuel pump.
- Replace fuel pump page 20
-7 .
- Install cover for fuel pump module.
Fuse 28 OK Relay in relay position 6 OK
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Fuel filter OK Battery fully charged
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20-12


- Disconnect fuel return line -1- at engine compartment bulkhead and
hold in measuring container.
- Connect remote control VAG 1348/3A with auxiliary cable VAG 1348/2
to fuse 28, connect positive (+) cable to battery.
- Operate remote control for 15 seconds (hold down button).

Fuel pump check valve, checking
Testing check valve Repair Manual, 2.8 Liter V-6 OBD II Fuel Injection
Ignition, Repair Group 24 - Compare quantity of fuel delivered with specified values for minimum
fuel delivery rate in graph, according to actual voltage at fuel pump.
*) - Minimum fuel delivery rate-fuel volume in cm3 (ml) delivered in15
seconds
**) - Voltage (V) at fuel pump with engine stopped, fuel pump running-
approx. 2 volts less than battery positive voltage (B+)
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20-13


Accelerator pedal cable and linkage,
servicing

1 -
Cable attachment
2 -
10 Nm (7ft lb)
3 -
Cable installation direction
Arrow
4 -
Cam Adjusting page 20
-15
5 -
Cable securing clip
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e=re
pair&id=AUDI.B5.GE01.20.1