The problems with coatings is tomorrows fuel. Every time the fuel changes, you see posts all over the net about peoples coatings partially dissolving and gumming up the carbs. It happened with MTBE and with ethanol.
I wrote up a way to "restore" a mildly rusted tank for the Rauder folks. Spacer Jim posted it to his site here.
http://www.spacerjim.com/faqs.htm It is "Get the Rust Out of Your Tank" and you can link directly here.
http://www.spacerjim.com/Fuel_System_Hygene.txtPlease ignore the spelling errors. I banged it out in a post, and it was copied here.
There is also a difference in the petcock on the Marauder, and therre is a fuel pump, so adapt as needed.