fuel line

Whilst crawling around under my Mini, I noticed that the rubber fuel line from
the tank to the pump, and pump to the steel line running forward was all
cracked.  It looked a hunnerd years old!  But in actuality is only 2 years
old.  I'm wondering if the heat from the muffler, which risides in the
neigborhood, may be affecting the life of the tube.  Does anyone know of any
1/4" high temp, low pressure tubing that is gasoline resistant and clampable?

Geoff Branch
'72 Mini
'74 Meejit (sleeping)