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Old 09-06-2012, 09:18 PM   #1
raheeli
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Air shutoff valve

Why there is a air shutoff valve in the air line going to Jet Pump. Whats the need of that. See attached picture?? anyone knows?
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Old 09-06-2012, 09:27 PM   #2
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I know it's there for a reason...you're not wondering what would happen if you removed it or something, are you.

You know the sucking jet pump is involved in moving fuel from one lobe of tank to the other....and that valve on our cars does something I'm sure we need...but I'd be guessing if I said I knew exactly what it is. Since it's mechanical and not electric, I'd imagine that when sucking jet pump comes on that the vac aids in moving fuel around in our tank...then closes when it's not needed anymore.

Maybe someone actually knows!

Why are you asking, if you don't mind me asking?
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Old 09-06-2012, 09:42 PM   #3
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Sucking Jet pump is for the brakes. It uses are from this line to create vacuum. So why the shutoff valve? I am thinking about taking it off. because my connector is broken anyways.
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Old 09-06-2012, 09:59 PM   #4
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Quote:
Originally Posted by raheeli View Post
Sucking Jet pump is for the brakes. It uses are from this line to create vacuum. So why the shutoff valve? I am thinking about taking it off. because my connector is broken anyways.
Probably to prevent excess vacuum, preserve vacuum, prevent backfeed, or some other function that will prevent damage. These cars are pretty well thought out. Just look at how much people bash the CCV; then when it comes time to preserve its function but use different parts nobody can figure out a solution that works as well and maintains proper crank vacuum.

If it's broken, fix it. Don't remove it. Also brakes are a pretty important so I would be incredibly hesitant to mess with them.
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Old 09-06-2012, 10:01 PM   #5
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Shows you what I know! Could've sworn it was involved in fuel too...evidently it is only involved in the brake...sorry about that!

Anyway, a googling turned this up

http://www.bimmerfest.com/forums/sho...d.php?t=578766

...and again, I think because it's there...and because it's involved in making your brakes work...I'd think seriously about driving without it. I'm not sure this is something you want to experiment with based on advice from the Internet...and I'm pretty sure a mechanic would tell you to fix it, not toss it.

Now I've got to figure out what I was thinking is involved in fuel transfer from one lobe to the other. The fuel pump doesn't both pump and suck, I don't think. I thought the sending unit on the left side was only a meter, but I guess it has a small pump in it...but thought that the transfer was vacuum controlled. I know I read something about this here...

Anyway /threadjack!
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Old 09-06-2012, 11:55 PM   #6
raheeli
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some models dont have that valve.
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Old 09-07-2012, 04:14 AM   #7
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Quote:
Originally Posted by dmax View Post
Shows you what I know! Could've sworn it was involved in fuel too...evidently it is only involved in the brake...sorry about that!

Anyway, a googling turned this up

http://www.bimmerfest.com/forums/sho...d.php?t=578766

...and again, I think because it's there...and because it's involved in making your brakes work...I'd think seriously about driving without it. I'm not sure this is something you want to experiment with based on advice from the Internet...and I'm pretty sure a mechanic would tell you to fix it, not toss it.

Now I've got to figure out what I was thinking is involved in fuel transfer from one lobe to the other. The fuel pump doesn't both pump and suck, I don't think. I thought the sending unit on the left side was only a meter, but I guess it has a small pump in it...but thought that the transfer was vacuum controlled. I know I read something about this here...

Anyway /threadjack!
You were right, there is a jet pump in the fuel tank system as well. That is the first thing I thought of as well.
But the pics did not match up with the name.
I think we are dealing with some different naming conventions here, and something that all cars do not have. I know I do not have anything like that, at least not that I have ever seen.
@OP - DMax's advice was still sound. There are not many parts put on here for no reason. Replace it or repair it, but don't remove it.
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