Quote:
Originally Posted by mr_robot
It's the vacuum line that connects from the intake hose to the brake booster.
On my 4.8is n62 the line goes inside through the ignition wiring box and out the back and into the strut tower to the brake booster.
Mine is in pretty bad shape and want to replace it as well but couldn't open the ignition wiring case in fear of breaking all the tabs.
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Are you sure about that? The brake booster will need actual manifold vacuum, and that line (from the parts diagram above) connects upstream of the throttle, where the pressure is close to atmospheric (slight vacuum due to Bernoulli).
My GUESS is that it is the fuel pressure regulator (part of the fuel filter) vent as others mentioned above. Basically it just lets a very small amount of gas vapors go somewhere pretty safe, and into the intake at atmospheric pressure is pretty safe.
To really confirm, if you want to, you could find the fuel filter and blow compressed air through the vacuum hose there to see if it indeed comes out this end.
If you need to replace it, (and if my fuel filter vent conclusion is right) I agree that generic vacuum hose of any sort should work fine. I used this awesome by-the-meter vacuum line for a few random replacements in my recent overhaul of my M54:
https://www.rmeuropean.com/Products/...FG21-V592.aspx
And nothing has blown up yet.
