The most common application of a petcock in an automobile is as a drain plug for a radiator. Historically, petcocks were used on gravity feed fuel systems found on automobiles. With universal adoption of fuel pumps they have all but disappeared in that application. Some historic examples of gravity feed systems include the Porsche 356 and early Volkswagens, which have a petcock with off, on, and reserve positions, much like a motorcycle petcock.
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Fuel petcock on a 1978 Yamaha XS400. 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.
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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).
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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.
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Hand-operated levers were used to raise and lower the diving fins and steer the rudder while a radiator petcock could be opened to regulate interior air pressure when necessary. The sub's entry hatch could be bolted closed and opened from the inside. Once completed, Minx and his brother Kurt then tested the sub several times in the shallow waters of Whitefish Bay. It seemed to work satisfactorily.
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The engine produced @ 8100 rpm. Yamaha XS400 in Cameroon (2019). A dual overhead- cam variant (XS400k) was also produced in 1982 and 1983 with a rear mono-shock and updated styling. The XS400 came equipped with a 6-speed transmission, wet plate, 6 friction disk clutch, chain drive, tachometer, self-canceling turn signals, both electric and kick starters, adjustable rear shock absorbers, center stand, and an automatic fuel petcock.
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It had a rear area where it could carry ammunition, since it could be used in ammunition dumps to carry ammunition around the dump.General Motors, p. 89. The M6 also was equipped with a winterization kit that included: an insulated battery box with a heating coil, a gasoline heater to heat the battery, and a petcock for the bottom of the fuel tank (for easy releasing of cold air and pressure from the gasoline tank).United States Infantry Association, p. 43.
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New colors including NaturalGear Camouflage were added. New features included a rollover sensor to kill the engine in the event the vehicle is partially or fully overturned, front disc brakes, fuel injection, increased power output, improved fuel mileage, elimination of the manual choke and much-easier cold starting, automatic compensation at different altitudes, automatic temperature compensation, a shorter engine warm-up period, and smoother idle. The manual fuel shut-off petcock was removed, with the PGM-FI an automotive style fuel gauge was added. When the fuel level reaches the E symbol a low-fuel warning light begins to flash letting the rider know that they have about 1.1 gallons of fuel remaining, or enough for approximately 28 miles of reserve range.
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