You should have a switch that turns the LP tank ON and Off. Usually has a red led light next to it. The defective hose runs from the filler to the tank input filler. Usually there is a adapter that drops the size from the tank to the remote connection. Do you have that approximate size of that line? You can have a hydraulic hose maker make the hose/line. Hyd Hoses are rated from 3000 psi up to more than 5000 psi. 3000 psi is more than overkill. ASME tanks rarely get over 300 PSI in hot weather. I would remove the bad hose and take to the Hyd hose maker so they can install the correct ends and diameter. You should have a Diesel which means HEAT is not a concern for that hose. Doug