HELP! Gas tank vent
With my tail light filler, I can't run a vented cap. I bought a small tank vent for a motorcycle, but I notice I can blow air both ways through it. Shouldn't it block air form one direction? I figure it should let air in the tank, but block gas from spilling out. What am I missing?
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67 C-20 LWB
56 Nomad--- nope, sold it 
75 Stingray
13 Silverado crew cab
08 Trailblazer (wife's)
Pittsburgh, PA
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