Quote:
Originally Posted by Junior
I have not tried to melt it but it does "go away" if you rub it between you fingers so i suspect it would melt.... Does this sounds like poly..? I'm really not sure what else it could be, the tank is clean.... and with just pump diesel in the tank there was never a problem.
any ideas how to deal with this or do i need to start looking for an aluminum fuel tank 
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Hello - The stuff you rubbed and made dissappear is fat that has a higher melting point that the rest. In winter, my outdoor WVO storage cubies get a lining of that whitish fat on the bottom, and in the summer it melts.
Steel tanks will eventually cause the WVO to polymerize and form that "chicken skin" which will make your life miserable. Aluminum tanks do not do this as much... but aluminum tanks that are not fully annealed after they are welded will eventually form micro-cracks in the welds and start leaking.
Keep the heat out of the tank, just use a heated pickup like a hot fox. Keep the tank as full as possible all the time. You can use a pourable tank liner in your steel tank to keep it from polymerizing your WVO. There are lots of liquid liner kits out there but I have had great luck with KBS.