SEAT Workshop Service and Repair Manuals

Fuel retention pressure: checking

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 prerequisites 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. –  Detach carpet under seats and fold it back.

–  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 adapter cable -SAT 1348/3-3- to contact -1- with an auxiliary cable from the auxiliary measurement set -VAG 1594C-. –  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 eye protection and gloves to avoid injuries and skin contact.

–  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. –  Close cut-off tap of pressure tester -V.A.G 1318- (lever at right angles to direction of flow -B-). –  Operate the remote control for short periods until an overpressure of approx. 4 bar has been reached. 4.8 bar.   WARNING Danger of spray when opening the shut-off tap, hold container over the pressure gauge free connection. –  If pressure builds up too high, lower excess pressure by carefully opening the shut-off tap. –  Observe pressure drop on tester. After 10 minutes the pressure must not drop below 4 bar. If the pressure drops further: –  Check the connections, O-rings and injectors for leaks. –  Test pressure gauge for leaks. If no fault in lines is detected: –  Fuel pump retention valve is faulty, replace the fuel supply unit → Chapter . Continue the installation in the reverse order of removal sequence, observing the following: –  Fit rear seat → bodywork - interior fitting work; Rep. gr.72.