Fuel pump delivery quantity, checking (vehicles with 8-cyl. MPI-engine)

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Fig 1: Identifying Remote Control Connection V.A.G 1348/3A

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2
Fuel pump delivery quantity, checking

Test conditions

Battery voltage at least 12.5 V.
Fuel filter OK
Fuel tank at least ¹ /₄ filled.
Fuel pressure regulator OK, checking →
- 24 MULTIPORT FUEL INJECTION (MFI) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMB
- 24 - MULTIPORT FUEL INJECTION (MFI) for 2.0 LITER 4-CYL. 4V TURBO FUEL INJECTION IGNITION, ENGINE CODE(S): BPG, BWT
- 24 MULTIPORT FUEL INJECTION (MFI) for 3.0 LITER 6-CYL. 5V FUEL INJECTION & IGNITION, ENGINE CODE(S): AVK, BGN
- 24 - FUEL INJECTION SYSTEM for 3.2 V6 4V FUEL INJECTION IGNITION, ENGINE CODE(S): BKH
- 24 - MULTIPORT FUEL INJECTION (MFI) for 4.2 LITER V8 4V FUEL INJECTION AND IGNITION, ENGINE CODE(S): BNS
- 24 MULTIPORT FUEL INJECTION (MFI) for 4.2 LITER V8 5V FUEL INJECTION AND IGNITION, ENGINE CODE(S): BHF
.

Ignition switched off.

Test sequence

Open fuse box cover at left side of instrument cluster.
Pull out fuse on fuse panel S228 (left row, 5th large fuse from top).

Fig 2: Connecting Remote Control V.A.G 1348/3A With Adapter Cable V.A.G 1348/3-2 To Right Socket Terminal Of S228

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2 to right socket terminal of S228.
Connect alligator clip to vehicle battery (+).
Remove fuel filler cap from fuel filler tube.
Remove rear seat bench →
- 72 - SEAT - FRAMES
- 72 - SEAT - FRAMES for BODY INTERIOR - CABRIOLET
.

Fig 3: Removing Cover Bolts For Locking Flange

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Unbolt cover for right locking flange - arrows -.

CAUTION: The fuel system is under pressure! Before opening system, place rags around the connection area. Then release pressure by carefully loosening the connection.

Fig 4: Identifying Fuel Return Line And Fuel Supply Line

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Disconnect fuel return line - 1 - by pressing release buttons.

NOTE:

Ignore - 2 -.

Fig 5: Fuel Line From The High Pressure Fuel Gauge Connected To The Disconnected Fuel Return Line

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Connect adapter V.A.G 1318/17-1 to disconnected fuel return line and hold it in a measuring container.
Press switch on remote control for 15 seconds.

Fig 6: Delivery Rate Diagram

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Compare quantity of fuel delivered with minimum delivery rate in diagram (cm ³ /15s).

NOTE:

Voltage at fuel pump with engine stopped and pump running is approx. 2 volts less than battery voltage.

Installation is in reverse order of removal. Note the following:

NOTE:

Secure all hose connections using hose clamps appropriate for the model type .

Install fuel return hose.