Checking For Leaks

Checking for Leaks

• Foam or air bubbles can form in the supply line.

• Lack of performance, misfire.

• Starting difficulties.

Special tools, testers and auxiliary items required

• Hose Clamps Up to 25 mm Dia. (3094)

• Cooling System Tester (V.A.G 1274) with adapter (V.A.G 1274/1 A) and diesel adapter (V.A.G 1274/2)

• Banjo Bolt with Seal (VAS 5187/1A) from the Pressure Gauge (VAS 5187)

Procedure

Follow the guidelines for cleanliness. Refer to => [ Clean Working Conditions ] Fuel Supply System.

- Carefully pull the engine cover off the 4 bolts one after the other - arrows -.






- Remove upper section of the intake manifold.






- Clamp off the fuel return line using a (3094).

- Remove the fuel return line from the high pressure pump - arrow -.

- Attach the (V.A.G 1274/2) and the (V.A.G 1274/1A) to the (V.A.G 1274).






- In place of the fuel return line, attach the (V.A.G 1274/2) to the high pressure pump with the (VAS 5187/1A).

- Install the (3094) at the following locations:






VF Supply hose to the fuel filter
RT Return hose to the fuel system cooler

- Create 1.0 to 1.5 bar pressure using the (V.A.G 1274).






- If pressure decreases continually, search for leaking areas and repair the malfunction.

• It is possible to check the fuel lines by moving the hose clamps from the filter to the connections on the fuel tank.

Assemble in reverse order of disassembling. Note the following:

- Tighten the fuel return line from the high pressure pump.