Here are a few reasons why:
1. Fuel Leakage: When the outboard is turned upside down, fuel can leak from the carburetor, fuel lines, or other components. This can create a fire hazard, especially if the fuel comes into contact with hot engine parts or sparks.
2. Damage to Internal Components: Turning the outboard upside down can cause fuel to flow into the engine's cylinders, which can damage the pistons, rings, and other internal components.
3. Oil Starvation: When the outboard is turned upside down, the oil pump may not be able to properly circulate oil throughout the engine. This can cause the engine to overheat and seize.
4. Water Ingression: Turning the outboard upside down can allow water to enter the engine through the exhaust port or other openings. This can cause the engine to rust or corrode.
It is important to use proper maintenance procedures when draining fuel from an internal tank. This may involve disconnecting the fuel line, using a drain plug, or consulting the manufacturer's manual for specific instructions.
