That's odd about 2 different size ends. The factory EPC shows it as being the standard bulk hose. Now up by the pump, there is a little return hose "S-shaped" which is a molded curved hose.
It's been yucky weather outside or I'd have gone farther. No progress, but I'll pull the exhaust pipe off(hopefully easy) and with better (and more access) address the problem.
So far everything has been quite doable. Just ussually have to take something off to get at what you want.

Michael