(a) A distributor who is properly licensed and permitted as a blender pursuant to this Act may blend petroleum-based diesel fuel with biodiesel and sell the blended or unblended product on any premises owned and operated by the distributor for the purpose of supporting or facilitating the retail sale of motor fuel.
     (b) A refiner or supplier of petroleum-based diesel fuel or biodiesel shall not refuse to sell or transport to a distributor who is properly licensed and permitted as a blender pursuant to this Act any petroleum-based diesel fuel or biodiesel based on the distributor’s or dealer’s intent to use that product for blending.