If the link that Fred posted turns out to be a dead end, look into the fuel line that DuBro offers to the R/C car crowd. They have tubing in several different colors, and the yello tubing looks, feels and performs very much like the Prather fuel line. I am not talking about the yellow Tygon fuel line that is meant for gasoline and diesel fuel. DuBro sells fuel line in short lengths and by the spool also.
It would be neat if the place Fred's link sends you do does have good stock of the punk stuff!!
Type at you later,
Dan McEntee