I bought a motorhome with a v10, sat for years before I got it, drained the tank except 15 gallons , topped off with 50 fresh 91 octane gallons, added seafoam. new filters ect. ran like crap. got a valve job. 100 miles later,valves stuck with tar. intake tarred up, complete teardown. heads in the shop again, now i wait to do it again. TF!$^&&G!! the valves had a half inch of tar on them??? how do I clean the tank?

 

take it off & have it steam cleaned & flushed out.

 

You didn't mention what kind of MH.

If it uses a stock style fuel tank, you may want to consider a new one. Aftermarket replacements can be found for well under $200.

 

its a 2000 bounder on a f53 chassis, who has tanks?