SEAT Workshop Service and Repair Manuals

Checking fuel pump delivery

Special tools and workshop equipment required

t	Pressure tester -VAG 1318-

t	Adapter -VAG 1318/11-

t	Adapter -VAG 1318/17-

t	Adapter -VAG 1318/23-

t	Adapter cable -SAT 1348/3-3-

t	Remote control -VAG 1348/3A-

t	Auxiliary cable kit -VAG 1594C-

t	Fuel-resistant measuring container

Test conditions l  Battery voltage at least 12.5 V l  Fuel filter is in good condition l  Fuel tank at least. 1/4 full. l  Fuel pump control unit -J538- in good condition; check → Chapter l  Ignition off. Checking sequence –  Remove rear right seat → general body repairs, interior; Rep. gr.72. –  Lift carpet under the seats and fold backwards.

–  Release retainers -arrows- at cover for sealing flange.

–  Release carefully electrical connection -arrow- on sealing flange and take off.

–  Connect the remote control -VAG 1348/3A- with the adapter cable -SAT 1348/3-3- to the contact -1-. Use the auxiliary measurement set -VAG 1594C- as an aid for this purpose. –  Join contact -5- to the bodywork earth using a cable from the auxiliary measurement set -VAG 1594C-. –  Connect crocodile clip of adaptor cable -SAT 1348/3-3- to vehicle battery (+). –  Remove filler cap from fuel tank filler neck.   WARNING Fuel system is under pressure! Before opening the system place a cloth around the connection. Then release pressure by carefully pulling fuel hose from connection. Wear safety goggles and appropriate clothing to avoid injury and contact with skin.

–  Disconnect fuel supply line -2- (by pulling release tab).   Note The vacuum pipe -1- remains connected.

–  Screw the adapter -VAG 1318/23- and the adapter -V.A.G 1318/17-1- on to the pressure tester -VAG 1318-. –  Fit the adapter -V.A.G 1318/17-1- to the disconnected fuel supply line. –  Screw the adapter -V.A.G 1318/11- on to the pressure tester -VAG 1318-. Connect the auxiliary hose -arrow- and insert the other end in a measurement container. –  Open cut-off valve on pressure tester. The lever indicates the direction of flow. –  Build up pressure in the fuel system; to do so, press the remote control switch and gradually close the pressure gauge shut-off tap, until it indicates:. l  Specification: approx. 4 bar –  From this point on do not move position of cut-off tap. –  Drain measuring container. –  Press remote control switch 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 the minimum flow rate of supply is not reached, this may be due to any of the following problems: t  Choked fuel lines. t  Blocked fuel filter. t  Fuel pump is defective. Continue the installation in the reverse order of removal sequence, observing the following: –  Fit rear seat → bodywork - interior fitting work; Rep. gr.72.