We purchased the Firman Tri fuel hybrid T07571 power generator at Costco Online. It runs OK using gasoline. But does not run on propane. We purchase two new AmeriGas 20 lb full tanks at HomeDepot. We use the Firman hose with regulator with meter connecting to the tanks. Before we hit the starter, the gas meter show full. When the engine turns over few strokes, we see the meter goes from full to zero. The engine died. Do you think the firman regulator is defective? How can I check the regulator is functioning? Thank you for your help.