gas tank vent hose melted - how to fix?

[no1of consequence]

on my 90, the plastic vent hose that runs from the tank [along side the fuel 
lines] up to the front of the car [to the carbon canister?] melted where it 
runs over the exhaust.

any ideas on how to fix? should i bother? i was planning to splice some fuel 
hose over it, but im not sure if it's under a lot of pressure and maybe is 
better to replace the whole line [massive pita]. or at least fix it such 
that it is well sealed. the plastic hose is really thick and stiff, which 
made me wonder about best fixes and using rubber to splice.

thanks
jim

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