Fuel System, Leak Test

WARNING: This page is about a different car, the 2010 Volkswagen Jetta and 2009 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

Follow the safety precautions when working on the diesel direct injection system. Refer to SAFETY PRECAUTIONS .
Observe the rules for cleanliness. Refer to CLEAN WORKING CONDITIONS .

Always follow these instructions before and during work.

Test Sequence

-- Remove the engine cover. Refer to ENGINE COVER .

-- Allow the engine run a few minutes at idle without pressing the accelerator pedal and then turn the engine off. The fuel system bleeds itself.

-- Check the entire fuel supply system for leaks.

If there are leaks despite the correct tightening specifications, replace the affected component.

-- Perform a road test where the accelerator pedal is pressed all the way down at least one time. Then check the high pressure area again for leaks.

NOTE:

Observe the safety precautions that apply to road tests. Refer to IF SPECIAL TESTING EQUIPMENT IS REQUIRED DURING ROAD TEST, NOTE THE FOLLOWING .

If there is still air in the fuel system, the engine may switch to emergency mode during the road test. Stop the engine and erase all Diagnostic Trouble Code (DTC) entries. Refer to "Guided Functions" in the vehicle diagnostic tester.

-- Install the engine cover. Refer to ENGINE COVER .