What is the reason why a motorcycle cannot start when the fuel is overfilled?
2 Answers
The reasons why a motorcycle cannot start when the fuel is overfilled are as follows: 1. The spark plug has high-voltage electricity and needs to be replaced; 2. The carburetor has no gasoline. It is recommended to loosen the carburetor drain screw to see if fuel flows out. If not, gasoline needs to be injected; 3. The carburetor is clogged. Clean the carburetor thoroughly; 4. The air filter and exhaust pipe are clogged and not ventilating. Replace or clean them. The hazards of overfilling a motorcycle's fuel tank: 1. Affects the performance of activated carbon: If the fuel tank is overfilled, the remaining space in the tank is relatively small, and with more gasoline, more volatile gasoline will enter the carbon canister. Over time, the carbon canister will fill with gasoline and produce particles, affecting the normal function of the activated carbon. 2. Causes fuel tank self-ignition: If the fuel tank is consistently overfilled and the domestic fuel quality is not good, the fuel hole of the carbon canister may become clogged, leading to excessive fuel tank pressure until cracks or loose rivets cause fuel leakage. This can easily result in self-ignition when exposed to sparks or hot weather.
I usually enjoy studying motorcycle structures. When the motorcycle's fuel tank is overfilled and the engine fails to start, the core issue lies in the fuel system. Excessive gasoline can flood the spark plug or enter the cylinder, causing the spark plug to become wet and fail to generate a spark, which naturally prevents the engine from starting. This is more likely to occur during cold starts or in low temperatures because the evaporation rate of fuel is slower. An overly rich fuel mixture can also result in too little air and too much fuel, leading to incomplete combustion. It's necessary to check if the spark plug is oil-fouled or damaged and to clean or replace it promptly. Another issue could be a blocked fuel tank vent, causing pressure imbalance. This problem is quite annoying, but during routine maintenance, avoiding a full tank and leaving some space can effectively prevent it. If you accidentally overfill the tank, try draining the excess fuel and restarting. If that doesn’t work, visit a repair shop to check the ventilation system and fuel injector issues. In short, proper maintenance can avoid most of these troubles.
