I was recently given a 1974 21 Ft Cobalt that has been stored about 5 yrs with appr 30 gallons of gas. Shortly before storage thesterndrive was serviced along with many other parts and was running fine prior to storage. I checked the tank through the float hole and it didnt seem gummed up(varnished) and smelled like gas, however I siphened some out and it is very tea colored. Engine wont quite fire, and at the most sputters and pops once in a while trying to turn it over. What can I do with 30 gallons of 5 yr old gas(seriously)?