Bad Seals
O-rings and gaskets can shrink, crack and lose their elasticity over time. Replace any part that shows signs of ageing.
Solenoid Valves
Larger engines, for example, those mounted on the mowers can incorporate a solenoid valve into the float cup. The solenoid is an electromagnet that opens a valve when voltage is applied to the coil, allowing the fuel to flow. Check with a multimeter that the voltage is being applied to the bobbin. (This also applies to starter solenoids.) In addition, solenoids may become clogged, or the valve may become clogged.
