SEAT Workshop Service and Repair Manuals

Test process

–  Remove the supply hose -1- (with white mark) and wipe up spilt fuel with a cloth.   Caution The fuel system is under pressure. Before opening the system, place a cloth round the connection point. Next, eliminate the pressure loosening the connection carefully.

–  Connect vacuum meter -V.A.G. 1318- to the supply hose -1- and with the adaptor V.A.G. 1328/10, and to the supply line with adaptor -V.A.G. 1318/11- and adaptor -V.A.G. 1318/16-. –  Open the shut-off valve of the pressure gauge. The lever points in the direction of flow. –  Start the engine and run it at idle. –  Test the fuel pressure Target value: approx. 2.5 bar

–  Remove the vacuum hose from the fuel pressure regulator -arrow-. The fuel pressure should rise to approx. 3.0 bar –  Switch off the ignition. If the target value is not reached: –  Test the flow of the fuel pump. → Rep. Gr.20 If the target value is not reached: –  Test the leakage and the retaining pressure, watching the drop in pressure in the pressure gauge. After 10 minutes, a minimum pressure of 2.0 bar should remain. If the retaining pressure drops under 2 bar: –  Start the engine and run it at idle.

–  Once the pressure is up, switch off the ignition, at the same closing the shutoff valve of pressure gauge -V.A.G. 1318- (lever perpendicular to direction of flow -arrow-). –  Watch the drop in pressure in the pressure gauge. If the pressure does not drop: –  Test the fuel pump retaining valve: → Rep. Gr.20 If the pressure drops again:

–  Open the shut-off valve of pressure gauge -V.A.G. 1318- (lever pointing in direction of flow). –  Start the engine and run it at idle.

–  As soon as the pressure is up, switch off the ignition, at the same time squeezing off flow in the return hose (with blue mark) -2-. If the pressure does not drop: –  Replace the fuel pressure regulator → Item If the pressure drops again: –  Test for leakage at the line connections, O-rings of the fuel distributor and injectors. –  Test for leakage in the pressure gauge.   Note! Before removing the pressure gauge, place cloths round the connection point.