When the engine is not operating, the fuel valve © is kept closed by the tension of the spring (D, which closes the fuel passageway and stops the flow of fuel to the carburetors.
When the engine has started, negative pressure (vacuum) @ is generated in the combustion chamber and reaches the diaphragm through a passage in the carburetor's main bore and the vacuum hose. This negative pressure (vacuum) ® is higher than the spring pressure which causes the diaphragm to force open the fuel valve © and allow fuel to flow to the carburetor assembly.
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.