SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4 cylinder 2.0 litre 4V Common rail TDI engine (2nd generation) | Fuel preparation system Diesel injection | Components of injection system

Fuel low pressure line: check

Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.

Special tools and workshop equipment required

t	Pressure gauge K-Jetronic -V.A.G 1318-, see equivalent → Anchor

Test prerequisites

l	Battery voltage min. 12.5 V

l	Fuel filter OK.

l	Fuel tank: full, at least ¹/₂ full.

l	Ignition switched off

Checking residual pressure

–	Remove engine cover panel -arrows-.

Caution

Risk of malfunctions caused by dirt.

To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection.

–	Release hose clip and detach fuel supply line -arrow- from high-pressure pump.

–	Connect K-Jetronic pressure tester -V.A.G 1318- to fuel supply line -2- with suitable adapter -3-.

–	Connect second hose -1- (from -V.A.G 1318-) to open connection on high-pressure pump, as shown in illustration below.

Note

In this way the K-Jetronic pressure tester -V.A.G 1318- is connected into the fuel supply line.

–	Connect a diagnosis tester.

–	Switch on ignition.

–	Select „Engine electronics“ in vehicle self-diagnosis.

–	Then select „Basic setting“.

–	Select „Checking fuel system pressurisation pump“ from the list.

–	Keep the fuel pumps running until the maximum fuel pressure has been reached.

l	Specification: minimum 3.5 bar

If specification is not obtained:

t	Leak in union between pressure gauge and fuel line

t	Leak in pressure tester

t	Leak in fuel lines and their connections

t	Fuel filter is blocked.

–	Check delivery rate of fuel pump → Chapter.

Note

Check fuel system for leaks.

SEAT Workshop Service and Repair Manuals