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EVAP VSV: Number of nipples

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Old 06-30-2011, 03:55 PM   #1  
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EVAP VSV: Number of nipples

Any idea why my Vapor pressure sensor VSV would only have two nipples? as I was putting the rest of the EVAP together I ran into a wall.

I attached a few photos. The first is of the diagram I was following to set up my EVAP(96' evap setup). The second is of the location I grabbed the VSV from the intake manifold.

Did they change the EVAP system after 2000-01?

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Old 06-30-2011, 04:33 PM   #2  
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Originally Posted by tacovr6 View Post
Any idea why my Vapor pressure sensor VSV would only have two nipples?
I'm at a bit of a loss as to how to explain it. But having replaced one like that on my sister's Mazda, I can assume it's probably similar in design. From what I understand of how it functioned, I'm having a harder time trying to figure out why one would have three nipples honestly.

Why two? That's all that's needed to allow the sensor to detect vapor pressure in the fuel tank, which is the whole purpose for it(I thought). That VSV is an electronically-controlled vacuum switching valve that allows vapor pressure from the fuel tank to travel in one hose and out the other hose to the sensor.

Why three? Maybe it has something to do with pressure in the canistor too? You tell me...I ain't that good at trying to guess what the OBDII does. Time to download that manual I suppose...

Oh, almost forgot. Just cap the line going to it that doesn't go to the fuel tank or sensor

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Old 06-30-2011, 05:08 PM   #3  
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interesting thought. capping it might work. I'll have to see if it throws any codes. Anyone else want to chime in?
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