Audi Workshop Service and Repair Manuals

Checking fuel pump delivery rate - 6-cyl. engine Special tools and workshop equipment required

t  Adapter -V.A.G 1318/17-1- from adapter set -V.A.G 1318/17-

t  Remote control -V.A.G 1348/3A- for V.A.G 1348 with adapter cable -V.A.G 1348/3-3- t  Fuel-resistant measuring container

Procedure Observe test conditions → Chapter. –  Remove filler cap from fuel filler neck. –  Remove rear seat bench → Rep. gr.72. –  Unclip the retaining tabs -arrows- for the flange cover (right-side).

–  Unplug electrical connector -arrow- at flange.

–  Connect remote control -V.A.G 1348/3A- for V.A.G 1348 to contact -1- using adapter cable -V.A.G 1348/3-3- and test lead from auxiliary measuring set -V.A.G 1594C-. –  Tape off 2nd connector contact of adapter cable -V.A.G 1348/3-3- with insulating tape -arrow- to prevent short circuits. –  Connect contact -5- to the body (earth) using a test lead from auxiliary measuring set -V.A.G 1594C-. –  Connect crocodile clip to battery „+“.

WARNING Risk of injury - fuel system operates under high pressure. To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection. –  Press release tab and disconnect fuel return line -arrow-.

–  Fit adapter -V.A.G 1318/17-1- onto disconnected fuel return line and hold adapter hose in measuring container. –  Press remote control button for 15 seconds.

–  Compare amount of fuel delivered with minimum delivery shown in diagram (cm3/15 sec.).   Note Voltage at fuel pump with engine stationary and pump running is approx. 2 volts less than battery voltage. If minimum delivery rate is not reached, check for the following causes: t  Fuel lines have been crushed. t  Fuel filter is blocked. t  Fuel pump is defective. Assembly is carried out in the reverse order; note the following: –  Install rear seat bench → Rep. gr.72.