Is the front of the boat high enough for fuel to be at the back of the fuel tank? Might be running out of gas.
Good thought Pete.:thumb:
If not ^ then here's some additional thoughts just to add to a possible list of many.
What RPM are you running the engine at while on the muffs? Should be 1300 rpm.
When it dies, pull the fuel filter to see how much fuel is inside....You may have to buy a EFI fuel pressure tester gauge to see if it's losing fuel pressure.
Since it's not really starting after shutting itself down, you may want to pull the spark plugs to ensure no water is getting down into the cylinders.
Or maybe being that you have an Alpha One drive, the shift cable isn't 100% adjusted right and possibly the shift interrupter switch is becoming activated but not affected by being under load in the lake water.
How many hours are on the boat?
Is the boat new to you?
Do you flush often for the same period of time in the same location as normal?
Fuel tank level lower then normal?
I'm using the dual engine flusher (muffs).
When I read Dual flush I was thinking Bravo stern drive which some have a low and side water pickup...But you have an Alpha drive. Have a photo of the muffs you are using for clarity ?