audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel and Residual Pressure before High Pressure Pump, Checking|Page 7509 > < Fuel and Residual Pressure before High Pressure Pump, Checking|Page 7507
Page 3
background image

-

Connect a pressure gauge adapter to the fuel line using the necessary adapters.

-

Connect assisting hose to pressure gauge and hold it in a measuring container.

-

Open shut-off valve of pressure gauge. Lever points in direction of flow.

-

Generate pressure in fuel system by pressing switch of remote control and slowly closing shut-off valve of pressure gauge.

‹› Specification: 4 bar positive pressure.

‹› From this point on do not move position of shut-off tap.

-

Empty measuring container.

-

Press switch on remote control for 15 Sec.

-

Compare quantity of fuel delivered with minimum delivery rate in diagram (cm3/15s).

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

If minimum delivery quantity is not obtained, the following malfunctions may be present:

‹› Fuel lines pinched

‹› Fuel filter clogged

‹› Fuel pump faulty

-

Assembly is performed in the reverse of the removal.

Fuel and Residual Pressure before High Pressure Pump, Checking|Page 7509 > < Fuel and Residual Pressure before High Pressure Pump, Checking|Page 7507