Pick up the right size tubing meant to be used as gas line. Remove the old line, and anything you have to to get access to where the line goes through the wall of the gas tank. The tubing is soft, and you can force it through the hole, which is a little undersized. You may have to cut the end on a slant and grab the tip you can get through with a pair of pliers.
It there are any leaks in the line at all, it will suck air instead of gas, and you will be lucky to even get it started.