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Hello my name is ***** ***** am I speaking with?
I read what you wrote, have you done any troubleshooting on your own yet? Have you ever personally seen the motor run correctly?
Are you still with me?
Have you ever personally seen the motor run correctly?
Got it. When was the last time it made full power without stalling?
Stalling at high speeds indicates the engine is simply running out of fuel. That can happen for 3 reasons.
1. There is some kind of blockage or restriction in the boats fuel tank and related plumbing. This can be anything from collapsing fuel lines, to crap in the tank, to a plugged up vent, or a bad antisiphon valve if the tank has one.
2. A weak fuel pump
3. Dirty carb
What we would do in the shop is first get a portable fuel tank and hook that up to the engine, and run It on that. If the stalling stops, then you know the problem is within the boats fuel tank and related plumbing, and that will need to be gone through in order to figure out why fuel isn't leaving the tank. If there is no change, then we would hook up a fuel pressure gauge on the output side of the carb, and run the boat as fast as it will go. Fuel pressure needs to be 3 to 7 psi at all times. This is a simple pass or fail test. If it's low, 99% of the time that means the fuel pump is bad. However, the fuel pumps do work off of crankcase pressures, and if compression is also low on the cylinder that drives the pump that can cause the pump not to deliver enough fuel. So if fuel pressure does end up being low, compression test the engine first before buying a new fuel pump. Compression pressures on something like this should be about 85 psi or better. If it is, then you can go ahead and get a new fuel pump. If during testing fuel pressure is good, and at least 3 psi when the engine stalls, then the problem is going to be in the carbs, and they are going to be dirty and not flowing enough fuel to sustain high rpm. Does that all make sense.
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