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quote from http://www.myturbodiesel.com/1000q/multi/boost-leak-tester-DIY-check.htm

"Any vacuum line that directly taps into the intake path will work. If you have a VW TDI, don't use a vacuum line that leads to the EGR because it's separated from the intake path by a diaphragm. The line from the N75 boost valve to the intake will work."

There are no "vacuum" lines on a MkIV or later (1999.5 or later) VW intake system. The N75 line does not attach to anything on either end that you would want to pressure test. One end attaches to the vacuum motor on the vane actuator the other end to the vacuum system - which is pump driven and has nothing to do with the intake.

It would be rare indeed to find a true vacuum line that connected directly to your air intake path on a turbo charged engine.

Perhaps this is a leftover from earlier models which had sensing lines off of the intake that carried pressure to actuators?
 

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quote from http://www.myturbodiesel.com/1000q/multi/boost-leak-tester-DIY-check.htm[/url It would be rare indeed to find a true vacuum line that connected directly to your air intake path on a turbo charged engine. [/QUOTE] Unless it is a gas engine that has a throttle valve to control engine speed. It is then very common.
 
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