The pressure in the tank and crankcase will be equal since they will be connected via a tube and thus form one large pressure vessel. The oil will flow at the normal pressure since the oil pump inlet "boost" from the crankcase pressure is exactly cancelled out by the crankcase backpressure being forced into the oil passages. The pump will do its thing, but there will be no increase in oil pressure over the stock system. So I was mistaken when I said backpressure would eventually stop oil flow. You will lose all the benefits of crankcase ventilation and will eventually start blowing seals and gaskets. Blow-by gases are essentially an "unlimited" source of pressure and will do its dirty work in short order. Believe me, I jury-rigged a crankcase vent filter on a compressor once and it blew off like a relief valve once the crankcase pressure rose high enough.