[Mike Pearson]

If you have foam in the fuel cell you could have problems. Especially if the color of the fuel is radically different. I haven't had too much problem going from C-12 to Sunoco blue. But going the other way from Sunoco blue to C-12 they always question the color of the fuel. C-11 is even more of a challenge. Pump the cell dry then add a small amount of the new fuel and pump it through then fill the cell with the new fuel and you should be OK. Best off to go to fuel check before the first run to check and make sure the new fuel will pass