I have a boat that has twin Mercruiser 7.4 motors with spin on fuel-water seperator filters. The starboard motor was starving for fuel and not able to achieve more than 3000 rpms. I replaced the filters and there was water in the fuel. You could see the water sitting in the bottom of a clear bowl when the fuel from the filter was poured in. I have been adding 99% rubbing alcohol to my fuel to help evaporate the water and bring it to the top to burn. I don’t think this is enough. After changing the filters I gained a few hundred rpms on the starboard motor but there is still a variance between motors. In addition, both motors cannot reach top rpms.
Does anyone know of a way short of running the boat and replacing filters until most of the water and fuel is gone to avoid this? Marine fuel docks seems to have a problem with water in teh fuel since ethynol was added. In addition, if you buy fuel when they have low tanks, that does not help either. Please help, thanks.