The line was collapsing at the tank and was replaced. I put a nipple in at the carb fitting (the ones that do not need a clamp) to blow into the tank and was easy to blow through the filter and into the tank. I found the problem!!! I couldn't get the nipple out and ran downstairs for a pair of pliers and on the way up the steps it caught fire. Evidently the little bit of air I blew (with my lungs) pressurized the tank and started a syphon which the propane heater ignited when it hit the floor. Raider was a total loss but the house was spared. Garage is in bad shape. I cannot stress enough having GOOD fire extinguishers and knowing their location. So this project is 'toast' sadly.