How much Sea Foam in a 55 gallon RV fuel tank to clean the system? [SOLVED]

Thanks for the question, David, and congrats on the RV!

To clean up the fuel system, your goal will be to create a relatively high cleaning concentration of Sea Foam to fuel. Wait until you have a low tank of fuel (1/4 tank or less), and add 3-6 oz of Sea Foam per gallon of fuel (three 16 oz cans would be a good cleaning concentration; you can also get 20 oz Truck & SUV size cans that would work great too). Drive at least 20 miles before refueling with fresh fuel (or as long as you are comfortable with on a low tank). That gives the treated fuel time to work through the system and clean.