No pictures, but yes, you need a flexible line between the frame and the pump since the engine is mounted on rubber and it moves enough to fatigue and break a hard line. There should be a brass fitting threaded into the pump housing to adapt the pipe thread in the pump to a 5/16" inverted flare on the steel gas line. Most real parts stores like NAPA will have a good assortment of brass fittings- - - -not so much the DIY places. They will also have the steel line you need from the pump to carb, and a loaner or rental tubing bender to route it correctly.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!