audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Removing and installing fuel delivery unit > < Checking fuel pump (electrical test)
Fuel supply system - Petrol engines
Fuel supply system - four-wheel drive
Checking fuel pump delivery rate

Special tools, testers and auxiliary items

  • ◆ Remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2
  • ◆ Measuring container

Requirements for test:

  • ● Battery voltage not less than 12 V
  • ● Fuel filter OK
  • ● Ignition switched off

Test sequence

 
A20-0098
  • ‒ Open fuse box cover on the left side of the dashboard panel.
  • ‒ Pull fuse No. 28 off fuse carrier (left row, 5th large fuse from the top).
  • ‒ → Connect remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2 to right-hand terminal of fuse socket No. 28 -arrow-.
  • ‒ Connect clamp to vehicle battery (+).
  • ‒ Remove filler cap from fuel tank filler neck.
  • ‒ Remove engine cover.

Vehicles with 4-cylinder engine:

Warning!
Fuel system is under pressure! Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.
 
A20-0278
  • ‒ → Pull off fuel return hose at connection on fuel distribution pipe.
  • ‒ Connect extension hose to fuel distribution pipe and hold end of hose in measuring container.

Vehicles with 6-cylinder engine:

 
A20-0259
Warning!
Fuel system is under pressure! Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.
  • ‒ → Pull off fuel return hose at connection on fuel distribution pipe.
  • ‒ Connect extension hose to fuel distribution pipe and hold end of hose in measuring container.

All models

 
A20-0260
  • ‒ Operate remote control for 15 seconds (keep button pressed).
  • ‒ → Compare the quantity of fuel delivered with specification.

    *)    Minimum delivery cm3/15 seconds

    **)    Voltage at fuel pump with engine stationary and pump running (approx. 2 volts less than battery voltage).

Removing and installing fuel delivery unit > < Checking fuel pump (electrical test)