By now you have tried the different LP tank and found that most likly it was a vaporizer that was allowing to much fuel and causing a flooding condition. If IMPCO lp it could also be the filter lock off vacumn line pulling extra fuel also.
that is my idea also man are we good lol
Try using a different fuel tank the one on the truck might be the problem.
Hello Ralph, If you could give us the Model, Serial # and the type of propane system ( Impco, asin) It make it allot easier to know what kind of unit you have. It's like saying i have a Ford truck that won't run, can you help.? I suspect your propane system needs new kits installed