Tandem Pump, Removing and Installing

Tandem pump, removing and installing
Observe safety precautions.
Observe rules for cleanliness.

Special tools and equipment





^ VAG1331 Torque wrench (5 to 50 Nm)
^ VAG1390 Vacuum pump
^ VAG1390/1 Fluid receptacle
^ VAG1921 Pliers for spring-type hose clips or VAS5024 Assembly tool for spring-type clips

Removing

WARNING:
^ The fuel and the fuel lines in the fuel system can become very hot (danger of scalding)!
^ The fuel system is also under pressure! Before opening the system, place cloths around the connections. Then carefully loosen the connection to release pressure.
^ Wear eye and hand protection when performing any type of repair work on the fuel system!





^ Pull supply hose -1- (white marking) and return hose -2- (blue marking) off fuel lines on cylinder head.
^ Attach hand vacuum pump VAG1390 with bleed bottle VAG1390/1 to return hose -3-.
^ Operate hand vacuum pump until no fuel is coming out of return hose. Observe that no fuel is siphoned into hand vacuum pump.





^ Remove vacuum hose -1- from brake booster of tandem pump -4-.
^ Remove supply hose -2- (white marking) from tandem pump -4-.
^ Remove securing bolts (arrow).
^ Remove tandem pump -4- from cylinder head.
^ Pull tandem pump -4- upward slightly, pull return hose -3- off (blue marking) and remove tandem pump -4-.

Installing
Installation is performed in reverse order. Note the following:

Note:
^ Observe correct seat of tandem pump coupling in the camshaft.
^ Always replace tandem pump seals.





^ Connect return hose -3- (blue marking) to tandem pump return connection.
^ Install tandem pump and tighten upper securing bolts to 20 Nm.
^ Tighten lower securing bolts to 10 Nm.
^ Connect supply hose -2- (white marking) to supply connection and vacuum line -1- of brake booster to tandem pump -4-.





^ Connect supply hose -1- (white marking) to fuel line of cylinder head.
^ Attach hand vacuum pump VAG1390 with bleed bottle VAG1390/1 to return hose -3-.
^ Operate hand vacuum pump until no fuel is coming out of return hose -3-. Observe that no fuel is siphoned into hand vacuum pump.
^ Connect return hose -2- (blue marking) to return hose -3-.