- Sep 10, 1999
I have always run natural color tanks in my bikes. I ran pump fuel in my '96, then switched to race fuel on my '98 and '01. The natural color tank discolored (yellowed) on the '96 and did not on the '98 or '01. Same premix used on all bikes. I can only conclude that there's something in pump gas that causes the tank to yellow. Anyone have a clue as to what specifically it is in the pump gas that does this? Oxygenation? Lack of lead? Space-age polymers? Sparkling drop of retsin?