How do you remove a propane conversion kit and return to gasoline on a Ford Econoline F-250 Van?

We bought a Ford Econoline at a government auction. It runs on propane. Does anyone know how we can return it to gas? The gas tank is removed.How do you remove a propane conversion kit and return to gasoline on a Ford Econoline F-250 Van?Check before you do this since the propane version is worth more than the gas version. It's easier to sell it to a courier service, and buy a gas version.How do you remove a propane conversion kit and return to gasoline on a Ford Econoline F-250 Van?It isn't a conversion kit if the gas tank is missing it probably came from the dealer like that It's the same physics of EFI just a totally different fuel system.And if some idiot took it off to make it lighter check to see if it's a flex fuel model which means it runs on both and there should be a switch or a solenoid somewhere along fuel system or inside cabin of the vehicle