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  #11  
Old 10-04-2018, 08:14 AM
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Ok so after you remove the plastic cowl/cover I guess the hose goes further in rather than into to the brake booster.

I couldn't see past that so assumed it was connected to it

So it goes further down and connects to the fuel filter?? What does it use it? EVAP?


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  #12  
Old 10-04-2018, 10:27 AM
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The fuel pressure regulator is built into the fuel filter and is (WAS PREVIOUSLY) vacuum modulated. BMW changed the programming in the DME so that fuel pressure no longer needs to be modulated by engine vacuum(probably partly because it also needs to deal with fuel pressure changes because of the jet pump system and the fact that the return is the bottom of the tank). Instead of making another part number fuel filter they just use the original parts and put the hose to the intake tube instead of the manifold. This way the regulator gets vented and if the diaphragm does ever rupture the excess fuel will get sucked into the engine and alert the driver immediately and not spew fuel on the ground till it gets noticed who knows when.
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Last edited by 80stech; 10-04-2018 at 10:53 AM. Reason: wording
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  #13  
Old 10-04-2018, 10:34 AM
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It is my understanding the vacuum line on the fuel pressure regulator is a vent only. The is no vacuum ahead of the throttle valve.
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  #14  
Old 01-20-2025, 05:05 PM
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Quote:
Originally Posted by X5only View Post
My X5 has this vacuum line (# 7 in the attached diagram) that is in pretty bad shape. Dealer asserts my car doesn't have it per their parts list. Other N62's vehicles don't have it either. What's the part number and what is it for? Any ideas? I know I could use any vacuum line, but amazed dealer doesn't know about it. Did my due diligence searching all over the internet, and yielding zero results. Realoem grays out the part and does not show its part number, meaning it doesn't exist in my vehicle, a 2005 X5 4.4 sports.
http://www.realoem.com/bmw/enUS/show...diagId=13_1033
I am so glad that i came across this! I have been trying to figure this out myself, as dealership informed me that this hose was no longer a hose in any way shape or form. They stated it was a vacum line, but did not say what to/for. I had been trying to figure out where it connects to and what it does. It seems that nobody is quite sure, as there has been a few suggestions.
I know it was connected to the intake boot, which some have stated i can cap off now? Do i not need this hose?
Was this a hose to vent the ccv diaphrams? As i just replaced those with the updated versions that do not have nipples.
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  #15  
Old 01-20-2025, 05:11 PM
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Read the thread, it's pretty much covered.
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  #16  
Old 01-20-2025, 05:13 PM
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Early N62's had vaccuum reference lines to the CCV valves, but those were removed pretty early on and the hoses should be removed and the bungs capped off if later CCV's without the vacuum nipples are installed.

The line in the picture 5 posts up from this post, is the fuel filter vent line - it goes from the fuel filter to the intake elbow in front of the throttle body.
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  #17  
Old 01-20-2025, 07:07 PM
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Quote:
Originally Posted by 80stech View Post
Read the thread, it's pretty much covered.
Thanks, i have re-read, i was just getting a bit confused as there were several suggestions as to what it could be. Looks like i do need this if it to vent fuel.

Quote:
Originally Posted by BimmerBreaker View Post
Early N62's had vaccuum reference lines to the CCV valves, but those were removed pretty early on and the hoses should be removed and the bungs capped off if later CCV's without the vacuum nipples are installed.

The line in the picture 5 posts up from this post, is the fuel filter vent line - it goes from the fuel filter to the intake elbow in front of the throttle body.
Mine never had any hoses attached, however it did have the earlier nipple diaphrams, which were shot. I assume there is nothing to bung in that case.
It does still have the all in one T branch breather hose, though i have the newer seperate ones on order.
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  #18  
Old 01-20-2025, 11:27 PM
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No this doesn't vent any fuel, just exposes the fuel pressure regulator to atmosphere without letting dirt or water in. You can disconnect it from the boot if you want but let the hose hang down and don't plug it, plug the fitting in the boot though. Leaving it hooked onto the boot might give you slightly less a chance of setting off a CEL with a plugged air filter but leaving it off eliminates the risk of sucking a large amount of fuel into the engine if the regulator diaphragm ruptures which is pretty rare but does happen. You should make sure the short portion at the regulator is OK as that is very likely in poor shape.

This is all M54 knowledge but it sounds like the V-8s have the same thing just looks a little different where it goes into the boot. The other end of the line goes onto a metal tube which runs down under the car to the fuel filter if you want to make sure.
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Last edited by 80stech; 01-20-2025 at 11:34 PM.
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