DIAPHRAGM 66M-24411-10 PAF15-07140100

Function and technical context

The 66M-24411-10 PAF15-07140100 diaphragm is a critical component of the fuel system on Yamaha F15 series outboard engines. This element acts as a fuel pressure and flow regulating valve, allowing the fuel to flow in a controlled manner from the tank to the engine injectors. Its correct operation is essential to maintain a stable fuel pressure, guaranteeing a balanced air-petrol mixture under all operating conditions. A deteriorated or cracked diaphragm causes fluctuations in supply pressure, resulting in poor starts, progressive loss of power and irregular fuel consumption.

When to replace this part?

The most common symptoms of diaphragm wear include difficulty starting cold, engine hesitation during acceleration, rough idling, and visible fuel leaks from the carburetor housing. Although there is no fixed maintenance interval for this part, it is advisable to check it every two years or after prolonged periods of storage, especially if the engine has been idle with fuel in the system. Preventive replacement is highly recommended before the high navigation season, since a failure in this component can leave the boat without propulsion in adverse conditions.

Equivalent manufacturer part numbers