So I have had the loud popping coming from the fuel tanks on my cyclone as others have stated. I never thought they were vented well or something. I was under the RV today and seen a black hose hanging down near the back tank. It was plugged up with mud so i cleaned it out. I traced the line and it came out of the top of the larger 30 gallon tank so i assumed it was a vent hose. Upon looking at the hose line, it was basically in a knot held together with a wire tie just where it came out of the top of the tank. No way it could vent with the hose all kinked. I cut the wire tie and straighted the hose out, pressure came out of the tank pretty rapidly. Seems like it will vent now and not pop/ boom all the time. My question is why would this hose have been tied up like this in the first place? Was there a reason for this from the factory?