James Sohl
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The Positive Crankcase Ventilation, pcv, valve goes in-line with the hose connecting the vapor separator to the air box. The idea is that the pcv valve permits crankcase vapor to flow into the inlet air stream for combustion into less harmful emissions. The pcv valve will close and block flow upon any overpressure in the air box due to popping, backfiring, etc. thus preventing any source of ignition (flame) from entering the crankcase ventilation plumbing. Crankcase vapor is flammable, and a significant backfire could, at least in principle, cause a fire.
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