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Thanks! According to the parts listing a 0438556 will fit the non VRO engines for 25 to 55HP from 1975 up into the 90s .You need the pump that screws directly over the pulse port on the side of the top cylinder.----One fuel hose in and one fuel hose out.-----Find the number for that pump on any of the 48 HP models of your 2 cylinder motor.