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2026. 6. 30. 작업
Why should the fuel petcock valve be turned to “Off” position when not using the vehicle?
The reason is that motorcycles traditionally have the fuel tank higher than the carburetor, and the fuel feeds with gravity alone. What risks does this introduce that necessitates a manual shutoff? Without the shutoff, if the carburetor float failed to close the valve tightly enough to stop the fuel flow, then gas would continue to trickle into the carb, overflowing the bowl and flowing down into the intake tract. If the intake valve were open, it would fill the cylinder. Then, upon attempting to start the motor, the incompressible liquid gasoline would cause a catastrophic hydraulic lock . More modern motorcycles have changed some of this in a few ways: the fuel petcock could be vacuum operated, closing with the engine off. the fuel tank could be lower than the carbs, making a fuel pump necessary. fuel injection has eliminated the use of carburetors and floats to control fuel flow.
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