I doubt that the tank needs cleaning. Im not sure I fully understand the symptoms. Can you be more specific as to that the problem seems to be. I understood from your first post that you think it is starved for fuel. If you are getting good pressure and flow from the fuel system then I would look elseware. Before I started fixing things that may not be broke I would get a good understanding of what the problems are. Can you elaborate a bit?
Im not sure what surging on fuel demand is.
I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k