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Fuel Supply System: Specifications Audi TT 8N facelift

Fuel System 9 illustrations ~1218 words

Tightening torques

ComponentNm
Mounting straps for fuel tank to chassis26
Fuel tank to chassis26
Fuel filler unit to bracket11
Ground (GND) wire at wheel housing10
Battery terminal to battery post5

Scheme 77

Scheme 77: Tank flap, component overview
Scheme 77: Tank flap, component overview

1 - Tensioning ring

  1. Small diameter

2 - Tensioning ring

  1. Large diameter

3 - Sealing cap

  1. With seal

4 - O-ring

  1. Replace if damaged

5 - Tank flap

  1. Removing and installing. Refer to «Removing»(ref-276268-S13030603902008021400000)

6 - Cylinder bolt, 4 Nm

  1. To remove tank flap, remove only three illustrated bolts. Refer to «Removing»(ref-276268-S13030603902008021400000)

7 - O-ring

  1. Replace if damaged

8 - Striker

9 - Compression spring

10 - Retaining plate

11 - Phillips-head screw

12 - Disengagement cable

13 - Rubber cup

  1. With overflow hose

14 - Fuel filler unit

ComponentNm
Tank flap to body4

Scheme 78

Scheme 78: Fuel pump and Fuel level sensor -G-, component overview
Scheme 78: Fuel pump and Fuel level sensor -G-, component overview

1 - Fuel pump

  1. Removing and installing. Refer to «Fuel pump, removing and installing»(ref-276268-S39642071452008010300000)
  2. Check Fuel Pump (FP) electrically. Refer to «Fuel pump, electrical testing»(ref-276268-S12469429932008010300000)
  3. Checking residual pressure

Refer to

  1. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276270-S08391981802008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMU
  2. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276271-S29225238592008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): ATC
  3. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276272-S33271097972008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AWP
  4. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276273-S13509179772008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): BEA
  5. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276275-S13244009452008010300000) for 3.2 LITER V6 4V FUEL INJECTION & IGNITION, ENGINE CODE(S): BHE

2 - Seal

  1. Always replace
  2. To install, place into opening of fuel tank when dry.

3 - Return line

  1. Blue
  2. From fuel rail
  3. Attaches to connection with "R" marking at connector flange
  4. To remove connector flange, press release button on connecting piece

4 - Supply line

  1. Black
  2. To fuel filter
  3. Attaches to connection with "V.marking at connector flange
  4. To remove from connector flange or from filter, press release button on connecting piece.

5 - 4-pin harness connector

  1. For Fuel Pump (FP) and Fuel level sensor -G

6 - Union nut, 80 Nm

  1. Use ring nut spanner 3217 to remove and install

7 - Fuel level sensor -G

  1. Checking resistance values. Refer to «Fuel level sensor -G-, checking»(ref-276268-S39023254162008010300000)
  2. Removing and installing. Refer to «Fuel level sensor -G-, removing and installing»(ref-276268-S29901669252008010300000)

Scheme 79

Scheme 79: Fuel pump, electrical testing
Scheme 79: Fuel pump, electrical testing

Special tools and equipment

  1. Ring nut spanner 3217
  2. VAG1348/3A Remote control
  3. VAG1348/3-2 Adapter
  4. VAG1526A Multimeter
  1. VAG1594A Adapter set

Requirements

  1. Battery voltage at least 12.7 V
  2. Fuse S228 OK (position 28)

Scheme 80

Scheme 80
Scheme 80
  1. Relay 4 in micro-central electrics (in driver's footwell, left) OK
  2. Fuel filter OK
  3. Ignition switched off

Work sequence

  1. Open cover of fuse box at left side of instrument panel.
  2. Remove fuse S228 at fuse carrier (position 28, left row, 5th large fuse from top).

Scheme 81

Scheme 81
Scheme 81
  1. Connect VAG1348/3A remote control connection using adapter cables from VAG1348/3-2 at right terminal of socket from fuse -S228- (arrow).
  2. Connect clamping terminal to B+.
  3. Press switch of remote control.

Noise of pump must be audible.

Note. Fuel Pump (FP) runs quietly. Surrounding noise should be avoided during test of the Fuel Pump (FP).

If no noise can be heard

TT Coupe

  1. Remove rear seat bench.

Refer to 72 - SEAT - FRAMES

TT Roadster

  1. Remove rear panel side trim.

Refer to 70 - INTERIOR TRIM

Continued for all vehicles

  1. Unscrew cover -1- at right (arrows).
  1. Disengage 4-pin electrical harness connector and remove (arrow).

Scheme 82

Scheme 82
Scheme 82
  1. Connect multimeter between terminal 1 and 4 of harness connector for voltage measurement.
  2. Press switch of remote control.

Specification: approx. battery voltage

If specified value is not obtained

  1. Locate and repair open circuit using wiring diagram.

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

If specified value is obtained, although no operating noise can be heard from pump

  1. Remove fuel pump. Refer to «Fuel pump, removing and installing»(ref-276268-S39642071452008010300000) .
  2. Check whether electrical wires between flange and Fuel Pump (FP) are connected, and test for continuity if necessary.

If no malfunctions are found in wires

  1. Fuel Pump (FP) is faulty. Replace fuel pump. Refer to «Fuel pump, removing and installing»(ref-276268-S39642071452008010300000) .
ComponentNm
Union nut for Fuel Pump (FP)80
Battery terminal to battery post5
ComponentNm
Tank flap to body4

Scheme 83

Scheme 83: Fuel pump, Fuel level sensor -G- and Fuel level sensor 2 -G169-, component overview
Scheme 83: Fuel pump, Fuel level sensor -G- and Fuel level sensor 2 -G169-, component overview

1 - Fuel level sensor -G

  1. Checking resistance values. Refer to «Fuel level sensor -G-/Fuel level sensor 2-G169-, checking»(ref-276268-S30079732002008010300000)
  2. Removing and installing. Refer to «Fuel level sensor -G-, removing and installing»(ref-276268-S33525315822008010300000)

2 - Fuel pump

  1. Removing and installing. Refer to «Fuel pump, removing and installing»(ref-276268-S31110051572008010300000)
  2. Check Fuel Pump (FP) electrically. Refer to «Fuel pump, electrical testing»(ref-276268-S13960680952008010300000) .
  3. Checking residual pressure

Refer to

  1. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276270-S08391981802008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMU
  2. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276271-S29225238592008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): ATC
  3. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276272-S33271097972008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AWP
  4. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276273-S13509179772008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): BEA
  5. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276275-S13244009452008010300000) for 3.2 LITER V6 4V FUEL INJECTION & IGNITION, ENGINE CODE(S): BHE

3 - Seal

  1. Always replace
  2. To install, place into opening of fuel tank when dry.

4 - Return line

  1. Blue
  2. From fuel rail
  3. Attaches to connection with "R" marking at connector flange
  4. To remove connector flange, press release button on connecting piece

5 - Supply line

  1. Black
  2. To fuel filter
  3. Attaches to connection with "V.marking at connector flange
  4. To remove from connector flange or from filter, press release button on connecting piece.

6 - 4-pin harness connector

  1. For Fuel Pump (FP), Fuel level sensor -G- and Fuel level sensor 2 -G169

7 - Union nut, 80 Nm

  1. Use ring nut spanner 3217 to remove and install

8 - 2-pin harness connector

  1. For Fuel level sensor 2 -G169

9 - Union nut, 80 Nm

  1. Use ring nut spanner 3217 to remove and install

10 - Seal

  1. Always replace
  2. To install, place into opening of fuel tank when dry.

11 - Secondary fuel pump

  1. With connecting flange
  2. With wiring
  3. Removing and Installing. Refer to «Secondary fuel pump, removing and installing»(ref-276268-S07794188802008010300000)

12 - Fuel level sensor 2 -G169

  1. Checking. Refer to «Fuel level sensor -G-/Fuel level sensor 2-G169-, checking»(ref-276268-S30079732002008010300000)
  2. Removing and installing. Refer to «Fuel level sensor -G-, removing and installing»(ref-276268-S33525315822008010300000)

13 - Hose coupling

  1. For fuel hose to secondary fuel pump
  2. To disconnect, press release button

14 - Retaining strap

  1. For fuel hose from secondary fuel pump
  2. Engage in fuel pump and press in locking mechanism
ComponentNm
Union nut for Fuel Pump (FP)80
Battery terminal to battery post5

Tightening torque

ComponentNm
Union nut for secondary fuel pump80

Scheme 84

Scheme 84: Component overview
Scheme 84: Component overview

1 - Cover

  1. For EVAP canister

2 - Vent line

  1. To Evaporative Emission (EVAP) canister purge regulator valve -N80

3 - Vent line

  1. From gravity valve and pressure retention valve at fuel tank

4 - Sealing piece

5 - EVAP canister

  1. Installation location: below spare tire compartment
  2. Removing and installing. Refer to «Evaporative Emission (EVAP) canister, removing and installing»(ref-276268-S19284793002008010300000)

6 - Vacuum line

  1. To Leak Detection Pump (LDP) -V144

7 - Bracket

  1. For air filter

8 - Air filter

9 - O-Rings

  1. Always replace

10 - Evaporative Emission (EVAP) canister purge solenoid valve -N115

  1. Checking. Refer to «Evaporative Emission (EVAP) canister purge solenoid valve -N115-, checking»(ref-276268-S30353001472008010300000)

11 - Retaining ring

12 - 5 Nm

13 - Bracket

  1. For Evaporative Emission (EVAP) canister purge solenoid valve -N115

14 - Electrical 2-pin harness connector

  1. Black

15 - Bushing

16 - Grommet

17 - Pin bolt, 16 Nm

18 - Grommet

19 - Washer

20 - Cap nut, 9 Nm

Scheme 85

Scheme 85: Evaporative Emission (EVAP) canister purge solenoid valve -N115-, checking
Scheme 85: Evaporative Emission (EVAP) canister purge solenoid valve -N115-, checking

Special tools and equipment

  1. VAG1526A Multimeter
  2. VAG1527B Voltage tester
  3. VAG1594A adapter set
  4. VAG1598/31 Test bos
  1. VAS5051 Vehicle diagnosis, testing and information system with VAG5051/1 Adapter

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