I have a 1992 Rinker w/a 4.3 Yamaha, I changed the raw water pump impeller, the housing looks great. With the output hose off the pump and the muffs hooked up I'm not pumping water. I removed the intake hose from the plastic pipe and put the hose down it, started the boat and it pumps great...
I'm having the exact issue as you. 92 Rinker, raw water pump housing is perfect, put new impeller in , ran a garden hose into the intake hose and it moves water great, put it on the muffs and nothing. What O ring are you referring to? One in the lower unit?
