Motor fitted Yardman 42inch ride on mower. I have plugged the fuel line after the filter. Removed both spark plugs to vent the machine. Is the needle valve in the carboretter stuck?
It certainly sounds like the needle valve is stuck.
If it is a gravity feed fuel system and a normal carburettor it sounds a particularly bad design not being equipped with a petrol tap to isolate the supply when the machine isn't in use. Gravity fed designs without a fuel tap would typically place the fuel level below the engine inlet ports to prevent that potentially dangerous and/or expensive type of flooding. The surplus fuel would then run from the carburettor float chamber vent which if it presented any immediate danger would be piped away.
As part of the investigation and repair it would be a good idea to change the engine oil.
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