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Fuel tank pressurising and spitting fuel out if cap?

I have a Ryobi 77 and for some reason it spits fuel out of the breather hole in the fuel tank cap????The engine runs fine...could it be a worn piston or ring???or maybe a leaking needle and seat????im confused

ryobimad
June 2013

Ryobi Garden Tools, Grass Trimmers Fuel Out Cap

It may be that the gas tank is overheating. When you heat up gas, it expand significantly. It also emit more fumes that are a real fire hasard.

Check the air flow around the engine.

A worn piston can't force air, or anything, back to the fuel tank. If it leaks, you loose power, contaminate the oil with unburnt and partialy burnt gas.

Electro
June 2013

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Fuel tank pressurising and spitting fuel out if cap?

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Fuel tank pressurising and spitting fuel out if cap?

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Fuel tank pressurising and spitting fuel out if cap?

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