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Fuel Vapor Valve? How to Test?

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Old 06-25-2004, 09:24 PM
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Mike S
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Default Fuel Vapor Valve? How to Test?

Still have a small vacuum leak that I'm trying to track down. Upon pressurizing the intake Port B on the pic was letting air flow right out. It's located on the top right of the engine bay near the fuse box when you open the hood.

1)I'm wondering if this is normal?
2) Is there a way to test that valve?
3)What's the real name of this thing?

Old 06-26-2004, 12:14 AM
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NZ951
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Throw it all in the bin. Cut the line near the tank maybe put a filter on it.
Old 06-26-2004, 12:29 AM
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Songzzz
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To answer your questions:

1) From your picture, everything looks normal, but i would suggest you tighten up the line with a cable-tie at point "C". That hose is prone to leak.

2) I don't if you can test if fuel-purging is working. But Yes, there a way to test for a vaccum leak. Simply pressurize the line going to "C", it should not leak. Line "A" goes to a odd-looking valve under the IM, i think the valve is a temperature sensor that has another vaccum line going to a nipple under the throttle body.

3)Name = Fuel Purge System.
Old 06-26-2004, 12:58 AM
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hosrom_951
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The black parts with A hose coming out is the called a vacuum valve, while the one other parts with C hose coming out is the vacuum control valve. These both go to the another vacuum control valve underneath the manifold (looks like rabbit ears). All three on my car are bad (getting strong smell of fumes at full throttle) as they are part of the fuel evaporator system. Replace all three and you should be fine.
Old 06-26-2004, 03:26 PM
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Chas
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So can you really cut all that junk out? From the way I understand it...the stuff in the picture just waits for the engine to warm up before it burns off fuel vapors

...I need to make a list of everything I can cut out of my car...idle stabalizer, cycling valve, etc.
Old 06-27-2004, 01:00 AM
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Claus Groth
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I have an extra set of the valves that are in front of the fuse box if anyone wants them for the cost of shipping.
Old 06-27-2004, 05:00 AM
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You have both of the valves (the control and vacuum) what condition are they?



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