Join Date: Feb 2012
Location: New Orleans Louisiana
Thanked 137 Times in 131 Posts
Rep Power: 6
Re: Cleaning fuel tanks
You just need to drain the tank and get to scrubbing. If you don't have a good place to drain it too you can do it with fuel in it, but it won't be nearly as complete a job. Just open the access hatches, and start scrubbing.
You have to test them, but some toilet bown brushes won't disolve in diesel, and work fine to stub the tanks. Only use clean, never used ones, then discard them afterwords.