No tricks, its just that the hose has bonded itself to the fitting. If you take pliers and twist the hose it will sometimes help break the bond. Or use a screwdriver to gently push the hose off.
If all else fails, cut and replace. Just take the old hoses to any auto parts store and they should be able to hook you up with the proper size of tubing. But the other end of the feed line is a pain to get to where it meets the firewall
