my motor is a mercury outboard 4cyl 2 stroke 50hp (500) 1962 . well anyways on the fuel pump side of the powerhead under the fuel pump there's a small hose that seems to go from #2 cyl to #1cyl it's like a 1/4" hose about 5" long with brass fittings on both ends that screw right into the head on both ends . well it's brittle and craked and need to replace it but i don't know what to ask for . is it some type of fuel hose or what ???????????? 
