This is not an easy one for us to offer advice on because we cannot see it. There are a lot of places that can leak water and there are a lot of parts that can wear out. You need to check the hoses and connections on all the tanks and spray bars. At least you can get parts for it now: http://www.vacsite.com/en/bissell-parts-1/bissell-parts/1970-quicksteamer.html
Answers & Comments
This is not an easy one for us to offer advice on because we cannot see it. There are a lot of places that can leak water and there are a lot of parts that can wear out. You need to check the hoses and connections on all the tanks and spray bars. At least you can get parts for it now: http://www.vacsite.com/en/bissell-parts-1/bissell-parts/1970-quicksteamer.html