I have a 75 sovereign
. My lines were totally blocked where the flex hose screws into the tank. Had to remove it and take it to a shop with a compressed air hose to blow it out. Also,check on your regulator and see where the "arrow" is pointing and make sure it's to the tank that you have already checked to make sure it had gas. I tinkered with mine for a day before finding out the lines were clogged. after opening, everything worked fine. Also, if you have the older-type tanks, go to a propane dealer. The dealer should have screw-in adaptors with the new type fitting. they cost about $10 each, much cheaper than a new retrofit. You also can use either your old flex hose or the new type plastic screw-on hose.