Are you talking about the hose that runs from the steel pipe that runs the length of the coach to the fuel tank in the rear? Mine had a 1/2" female thread to male barb coupler on it that took a slip-on piece of hose. Just make sure it's rated for fuel... I dont know what Fleetwood used in '85, but after a few years mine came apart in my hand.
Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350