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

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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.