I've had this Coleman duel fuel for 2 weeks and used it 5 times and already having a problem. I use unleaded gasoline in it. The problem that came up last night was when I adjust the valve to full power the white light goes to full on flames shooting out of the top and when I turn it back down it goes back to normal but with less light. Anyone know what's up like I said I've used it 5 times and it shouldn't have a leak in it already should it?