DIAPHRAGM KIT 15170-94J00

Function and Technical Context

The 15170-94J00 diaphragm kit is part of the fuel pump assembly for Suzuki outboard motors and is designed to restore the seal and proper operation of the diaphragm mechanism responsible for pumping fuel from the tank to the carburetor. The diaphragm operates within the fuel supply system, acting as a flexible element that generates pumping pressure through the pulsating motion transmitted from the engine. When this component deteriorates, the pump loses its priming ability, which can cause fuel supply interruptions, difficult starts, or unexpected engine shutdowns while underway. Replacing it in a timely manner ensures that fuel flow remains constant and the engine responds smoothly under all operating conditions.

When should this part be replaced?

The most common symptoms of a faulty fuel pump diaphragm include difficulty starting the engine when cold, drops in RPM under load, fuel leaking from the pump housing, or the presence of fuel mixed with oil in the crankcase—an unmistakable sign that the diaphragm has ruptured. It is recommended to inspect the diaphragm during every seasonal maintenance check and to replace it preventively every two to three years, as the rubber ages due to expansion-contraction cycles and continuous contact with gasoline. Replacing the entire kit preventively avoids breakdowns at sea and extends the service life of the fuel pump itself.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer Part Numbers