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Old 06-01-2020, 14:25   #1
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Yanmar 4 cylinders 54 hp

For the 2nd time in 2 days motor just stopped
Yesterday restarted guickly
Today longer time to start
Both days had run at 22 to 2400 rpm for an hour befor stop
When i tied up ran for 35 min no problem
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Old 06-01-2020, 15:04   #2
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Re: Yanmar 4 cylinders 54 hp

Sounds like you’re creating a vacuum on the fuel line, assuming you’re not having to bleed on the-start? I’d start with your filters then your pick up in the tank and see if something is blocking the tube intermittently.
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Old 06-01-2020, 15:16   #3
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Re: Yanmar 4 cylinders 54 hp

Pull the dip tube out of the tank, it may have a filter sock on it.
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Old 06-01-2020, 15:29   #4
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Re: Yanmar 4 cylinders 54 hp

Start with the simple stuff.

Since it runs a quite a while before if stops, check the fuel tank vent (crack the fill opening and see if it still does it)

drain and clean the separator and change both filters

Consider connecting a Jerry can of fuel up to engine to see if it runs that way. Which isolates the tank and any related issue

Good luck
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Old 07-01-2020, 10:16   #5
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Re: Yanmar 4 cylinders 54 hp

I have a computer controlled 4JH57. It requires fuel to not be hot. However, excess fuel is used to cool the injectors and returns to the tank. If your tank is low, or like mine the return is near the tap, it can heat up and exceed the limit. The engine will shutdown. I had to add a fuel cooler to solve the problem. An extra panel to display the error costs $1,500. Good luck!
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