There’s fuel leaking through my air filter.

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The common cause of fuel leaking around air filters is due to carburettor issues.

Your carburettor float is designed to maintain pressure inside the carburettor by closing off the system at a certain fuel level, the fuel float can become stuck, resulting in fuel escaping from the carburettor into the vent tube & air filter alternatively a damaged or dirty carburettors could be the issue, if your engine’s carburettor is dirty or cracked, then it could also lead to leaking fuel around the air filter