VSV valve

Jul 16, 2010
Under what conditions should the vsv open up the vent line from the charcoal filter to the manifold vacuum? Mine is a deamogged April 77’ 40. Gas tank is getting pressurized like crazy. I can easily draw air (fumes) by sucking on the line. It’s clear. The VSV is just not opening it up.

I’ve pulled the control module and given it a good cleaning and ensured the connections are nice and shiny. When should it open per design?

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