DOUBLE FILTER WITH 75/500MAX VALVE

Function and technical context

The RAC75/500MAX double filter with valve is part of the fuel supply system in medium and high power marine engines, acting as a purification barrier between the tank and the injection pump or carburetor. Its dual-stage filtration design allows it to retain impurities, emulsified water and suspended solid particles that, if they reach the injectors or internal engine components, would cause premature wear, misfires or loss of performance. The integrated valve makes it easy to shut off flow during maintenance or in emergency situations without needing to empty the entire circuit, which is especially valuable in fixed onboard installations. With a maximum flow capacity of 454 lph and a pressure drop contained in 0.70 PSI at a working pressure of up to 15 PSI, this filter ensures the constant supply of clean fuel without compromising the pressure in the feed line.

When to replace this part?

The most common symptoms of a deteriorated or clogged marine fuel filter are: difficult or irregular starting, progressive loss of power at full speed, engine jerks or cuts under load and abnormally high fuel consumption. In double filtration systems, the presence of water in the collecting vessel or the change in color of the filter element are clear indicators that the cartridge has reached the limit of its retention capacity. It is recommended to check and replace the filter element every 100 hours of navigation or at the beginning of each season, advancing the change if it has been operated with fuel of questionable quality or after a prolonged period of inactivity of the boat.

Equivalent manufacturer part numbers