Mercury - Quicksilver Carburetor Diaphragm Kit Fuel System Component Vintage 2-Stroke 5137. Overview. If your classic Mercury or Mariner 2-stroke is starting to stumble or lose power, it could be time to freshen up the carb. The Mercury Marine 5137 Quicksilver Carburetor Diaphragm Kit is built for vintage 7.5-50HP Mercury and Mariner outboards, restoring the flexible internal parts that control fuel delivery. Over time, old diaphragms harden or crack, causing lean conditions or rough idle. This