Tank issues are pesky problems ,if you eliminate it as one of your problems you can work forward knowing it was addressed.I bought 2 nonrunning vehicles that were proven tank issues at the end.The tank for the wagon being a flatter one will give rise to more issues ,more area to rust if fuel has evaporated over the time sitting , the biggest enemy to the tank, that grud just sitting their until new fuel is introduced is an awaiting gremlin.A radiator shop will sometimes take on the cleaning of a fuel tank.