MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone.
You are invited to join our public Boat Repair Forum to seek assistance from other members.
You may also visit the Boat Motor Manuals section of our site to obtain a service manual.
This motor ran fine up until last season, When it would not run at high speed. It runs fine now if you feed it fuel. The fuel pump is only pumping enough fuel for trolling speed. Proven by fuel pressure gauge. Looking at the old fuel pump removed, Does not look like there was any thing wrong with it. If its not lack of pulse from the port. I do not know what to try next.
Good luck and keep us posted
Thanks for the update.... do you happen to know which seals were replaced? Are we talking about the crankcase here?... if so, you must have had a serious bill on labor cost I imagine?... (Just curious here)Just to let everyone know. I took the motor to the shop. The problem was faulty seals,thus low pulse to the fuel pump.IT FOOLED me until I did fuel pressure test...So don't rule this out even if it might be rare. Thanks.
Sounds like your fuel pump diaphragm is weak or badOK, here is what happens when I turn on full throttle. Just about the time it tries to plane the boat it runs out of fuel, pumping the bulb will help but never will reach full speed. If I do not pump the bulb it just goes flat, and motor stops. Then I can prime the bulb and the motor will start right up and run fine at slow speed. Have checked the carb. again, it is spotless inside, high speed jet is clean, float level is correct. The fuel pump is new. The bulb with line and connectors are all new. Only thing I can come up with now is the pick up tube in the tank. See no way in to it. Maybe try to blow it out with air. Untill I can find another tank to try??? any other ideas welcome. Wanted to add. This will not happen with motor on test stand. It will run full speed. It has to be in the water pushing the boat under load.