This may or may not help, but use this link to diagram and look @ part #'s 40, 41, 43, 46, 47, 48, and 49.
diagram shows where hoses and tee's go.
http://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1993&hp=28&model=J28ESLETD&manufacturer=Johnson§ion=Intake+Manifold