I have a Mr. Heater, Little Buddy (the single bottle, single tank model) heater that is supposedly able to be connected to a bulk propane tank. I bought the Mr. Heater hose and filter they recommended but when I try to run the heater I can either not get it to light at all, or if I do, it only burns for about 5 mins then it turns itself off. It runs just fine with the disposable 1 lb tank. I know it is not the oxygen sensor that is the problem. Any suggestions or has anyone else had a similar problem?