![]() Since these contaminants are heavier than aviation fuel, they settle in a sump at the bottom of the strainer assembly.After leaving the fuel tank and before it enters the carburetor, the fuel passes through a Fuel Strainer which removes any moisture and other sediments in the system. ![]() Fuel/Oil coolers function by exchanging the hot oil against cold fuel for cooler oil against now warmer fuel.If the tanks have been filled on a hot day, it is not unusual to see fuel coming from the overflow drain.This allows fuel to expand with increases in temperature without damage to the tank itself.Fuel tanks also include an overflow drain that may stand alone or be collocated with the fuel tank vent.The tanks are vented to the outside to maintain atmospheric pressure inside the tank through the filler cap or through a tube extending through the surface of the wing.Tanks will have a filler opening on top of the wing through which they can be filled.The fuel tanks, normally located inside the wings of an airplane, vary in construction by aircraft, but generally use aluminum, a "wet-wing," or flexible bladders.The fuel system consists of component, controls, and indicators.Flash Point: the lowest temperature at which a combustible liquid (fuel) gives off vapors in sufficient quantity to ignite with the application of flame.When enough vapors are formed so fuel will ignite readily, that is the flash-point.An increase in temperature increases volatility, forming more vapors.A more highly volatile fuel will vaporize at lower temperatures than fuel with lower volatility rating.Volatility: a fuel's tendency to vaporize.The auxiliary pump, also known as a boost pump, provides added reliability to the fuel system and is electrically driven by a switch in the cockpit.The main pump system is engine driven with an electrically driven auxiliary pump provided for use in engine starting and in the event the engine pump fails.Aircraft with fuel-pump systems have two fuel pumps.For example, on low-wing airplanes, the fuel tanks in the wings are located below the carburetor requiring a pump.If the design of the aircraft is such that gravity cannot be used to transfer fuel, fuel pumps are installed. ![]() For example, on high-wing airplanes, the fuel tanks are installed in the wings, and the fuel is gravity fed through the system and into the carburetor.The gravity-feed system utilizes the force of gravity to transfer the fuel from the tanks to the engine. ![]()
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