I can't imagine they'd develop a taste for gasoline.  Polyamide 12 (nylon) tubing is available in several colors but black is the most UV stable.   It is also available with stainless steel braiding like fuel injection tubes on a Golf/ Jetta engine with CIS.

Mike B.

Sent from my iPhone

> On Mar 2, 2014, at 11:15, George Wietor <wietorg@YAHOO.COM> wrote:
> 
> Would it be practical to armor our fuel lines with stainless braid?
> Local maple sugar enthusiasts claim that particular colors of plastic tubing used for transporting sap deter rodent gnawing. George