SEAT Workshop Service and Repair Manuals > Leon Mk1 > Power unit | 4-cylinder diesel engine with pump injector unit, mechanics | Fuel supply, gas operation | Fuel supply components: Installing and removing:

Tandem pump: checking.

t	Test requirements → Anchor

t	Work sequence → Anchor

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

Special tools and workshop equipment required

t	Tandem pump tester -VAS 5187-, see equivalent → Anchor

t	Torque wrench kit -SAT 8010-, see equivalent → Anchor

Test requirements

l	Coolant temperature, 85 °C minimum

l	Pump injectors, good

l	The fuel filter and the fuel lines must not be clogged

l	The retention valve on the fuel supply hose must be working correctly

Work sequence

–	Locking bolt -arrow-.

–	Connect the manometer -VAS 5187- as shown in the diagram.

–	Start engine and run at idling speed.

–	Increase the engine speed to 1500 rpm.

–	Read the pressure on the pressure gauge:

l	Specification: min. 3.5 bar

If the specification is not obtained:

–	Pinch off the return pipe between the fuel filter and the tandem pump with a hose clamp.

–	Carry out another test.

If the specified value is achieved:

–	The tandem pump is operating correctly. Replace the O-ring of the injection pump → Chapter

If the specification is not obtained:

–	Replace the tandem pump → Chapter.

Note

Tighten the seal bolt following the removal of the manometer to 25 Nm. Replace the seal .

SEAT Workshop Service and Repair Manuals