SEAT Workshop Service and Repair Manuals

Test sequence

–  Pull off the supply hose -1- (with white marking) and catch the fuel which runs out in a cloth.   Caution Fuel system is under pressure! Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.

–  Connect pressure gauge -V.A.G 1318- with adapter -V.A.G 1318/10- to supply hose -1- and with adapter -V.A.G 1318/11- and hose adapter -V.A.G 1318/16- to supply pipe. –  Open shut-off tap on pressure gauge. The handle points in through-flow direction -arrow-. –  Start the engine and run at idling speed. –  Measure fuel pressure. Specification: about 2.5 bar.

–  Pull vacuum hose off fuel pressure regulator -arrow-. The fuel pressure must increase to aprox. 3.0 bar –  Switch off ignition. If the specification is not obtained: –  Check quantity supplied by fuel pump: → Chapter If the specification is obtained: –  Check for leaks and holding pressure by observing pressure drop on gauge. After 10 minutes, there should be a residual pressure of at least 2.0 bar If the holding pressure drops below 2 bar: –  Start the engine and run at idling speed.

–  Switch ignition off after the pressure has built-up. At the same time close pressure gauge -V.A.G 1318- cut-off tap (handle transverse to flow direction -arrow-). –  Observe pressure drop on gauge. If the pressure does not drop: –  Check fuel pump non-return valve: → Chapter If the pressure drops again:

–  Open pressure gauge -V.A.G 1318- shut-off tap (handle in direction of flow). –  Start the engine and run at idling speed.

–  Switch ignition off after the pressure has build-up. At the same time clamp-off the return hose (with blue marking) -2-. If the pressure does not drop: –  Renew fuel pressure regulator → Item. If the pressure drops again: –  Check pipe connections, O rings on fuel manifold and injectors for leaks. –  Check pressure gauge for leaks.   Note! Before removing pressure gauge place a cloth around the connections to be loosened.