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Fuel Reserve
In motorcycles and cars, the ''fuel reserve'' setting indicates that the level of fuel in the tank is low. In cars and most modern motorcycles this quantity (the reserve) is automatically available. Older motorcycles have a manual fuel tap or petcock. When the main fuel is exhausted, the motor will start sputtering, prompting the rider to change the position knob to continue riding with a known smaller quantity of fuel. Generally, when a rider notices that the engine began sputtering, he or she will have enough time to turn the petcock and access the reserve fuel before the engine shuts down. Most petcocks have three positions: * OFF - This position is important to keep the tank from leaking when the engine is off. Whether it is present or not depends on the type of carburetor that is used. * MAIN - This is the normal setting when the engine is running. Sometimes this position is labeled "ON" or "RUN". * RESERVE - In this position, a known but small volume of fuel is available to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petcock
A petcock is a small shut-off valve used to control the flow of liquid or gas. Historically, petcocks were threaded valves controlled by a butterfly handle; modern petcocks are typically ball valves. Compared to the progressive control of a gate valve a ball valve style petcock's is coarse, confining their use principally to on-off applications. Use Motorcycle Most older motorcycles have a three-position fuel petcock valve (known as a "petrol tap" in the UK) mounted on or nearby the fuel tank to control the supply of gasoline: on, off, and reserve. The reserve position accesses the bottom portion of the fuel tank. Many older motorcycles lacked a fuel gauge, making reliance on a fuel reserve a relatively common experience. Most now have an automatic, vacuum operated petcock (that may include a prime position which bypasses vacuum operation and allows fuel to flow to the carburetor without the engine turning over). Automobile The most common application of a petcock in an au ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |