Audi Workshop Service and Repair Manuals

Checking fuel pump delivery rate - vehicles with 8-cylinder FSI engine Special tools and workshop equipment required

t  K-Jetronic pressure tester -V.A.G 1318- t  Adapter set -V.A.G 1318/10-12-

t  Remote control -V.A.G 1348/3A- for V.A.G 1348 with adapter cable -V.A.G 1348/3-2- t  Fuel-resistant measuring container

Test conditions l  Battery voltage at least 12.5 V l  Fuel filter OK l  Fuse in fuse holder -S228- (position 28) OK.

l  Fuel pump control unit -J538- OK; checking in “Guided Fault Finding” using vehicle diagnostic, testing and information system -VAS 5051B-. l  Fuel tank at least 1/4 full. l  Ignition off.

Test sequence –  Remove rear seat bench → Rep. Gr.72. –  Unscrew cover for flange (right-side) -arrows-.

–  Pull wiring with connector -arrow- out of opening for flange and move to one side.

–  Unplug electrical connector -arrow- at flange (right side of vehicle).

–  Connect remote control -V.A.G 1348/3 A- with adapter cable -V.A.G 1348/3-3- to contact -1- using a test lead from auxiliary measuring set -V.A.G 1594C-. –  Tape off 2nd connector contact of the adapter cable -V.A.G 1348/3-2- with insulating tape -arrow- to prevent short circuits. –  Connect contact -4- to the body (earth) using a test lead from auxiliary measuring set -V.A.G 1594C-.

–  Slide cover to right -arrow 1- and lift it off -arrow 2-. –  Connect crocodile clip to positive terminal (+). –  Remove filler cap from fuel filler neck.

–  Pull off rear engine cover panel -arrows-.

WARNING The fuel system is pressurised. Before opening the system place a clean cloth around the connection. Then release pressure by carefully loosening the connection. –  Disconnect fuel supply pipe -arrow- at fuel rail.

–  Connect K-Jetronic pressure tester -V.A.G 1318- with adapters -V.A.G 1318/11- and -V.A.G 1318/12- to fuel pipe. –  Fit auxiliary hose -arrow- onto pressure tester and hold end of hose in measuring container. –  Open cut-off valve on pressure tester. Lever must point in direction of flow. –  Build up pressure in fuel system by pressing the remote control and slowly closing the cut-off valve on the pressure tester. l  Specification: 4 bar –  From this point on do not move position of cut-off valve. –  Empty the 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. Assemble in reverse order. –  Connect fuel line. Tightening torque

Component		Nm
Fuel line to fuel rail		28