No, I understand what you are saying. The fuel sloshing has nothing to do with whether or not there is pressure or vacuum in the tank. If what you are saying was true, even the later setup would blow fuel out with fuel slosh. I still say you have the wrong cap or it's junk, fuel sloshing shouldn't open the vent on the cap, regardless if the tank is vented or not and if the tank is vente
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Dodge Sweptline Truck General Discussion