May likely be one of two problems:
1. Fuel flow: Make sure fuel tank vent is open and not blocked while engine running. Check primer bulb is working and no air leaks along hose anywhere. Check function of fuel pump and ensure fuel is getting to the cylinders.
2. Overheating: Check engine isn't overheating and that water pump is operating properly while engine is running.
How do u change a fuel pump on a 40 hp johnson boat motor
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