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J. engine fuel sys

engine fuel systems 10

QuestionAnswer
what type of pump can vary the amount of fuel discharged regardless of speed? a variable displacement pump.
what is used to keep water, sediment, and foreign matter out of the carburetor? the main fuel strainer.
what is the purpose of a pressure relief valve in a constant displacement pump? it return excess fuel that is not required by the engine to the inlet side of the pump.
what type of engine-driven fuel pump is widely used other than gear or piston pumps? a rotary vane type.
what function do fuel boost pumps perform? they supply pressurized fuel to the fuel pump, which helps prevent vapor lock and cavitation.
what is a commonly used type of fuel boost pump? the centrifugal type.
what causes vapor lock and why is it of concern? vapor lock is caused by insufficient fuel pressure, high fuel temps and excessive fuel turbulence, which may completely block any fuel flow resulting in engine failure.
what function does the engine-driven pump on a turbine engine perform? it provides a continuous supply of fuel at the proper pressure while the engine is running.
name the two categories of turbine engine pumps. constant and variable displacement.
what category is a gear-type pump classified in? constant displacement.
when performing an internal inspection of an engine-driven fuel pump, what should you look for? leaks and security of mounting.
what is the purpose of a shear section of the driveshaft in a dual element constant displacement pump? if one element seizes, a portion of the driveshaft seizes, allowing the other element to continue to operate.
where in a turbine engine fuel system is ice formation likely to occur and how is it prevented? the fuel filter is most susceptible to ice formation, so a fuel heater is used that consists of a heat exchanger using either engine oil or bleed air to warm the fuel.
what is the purpose of a bypass valve in an engine fuel system micron filter? it is a safety feature that allows fuel to flow to the engine if the filter becomes blocked.
what is the purpose of a duplex fuel nozzle? a duplex fuel nozzle discharges two different spray patterns. the spray pattern is wider during start up and acceleration and narrows when engine speed increases above idle.
what are the functions of the pressurizing and dump portions of a pressurizing and dump valves? the pressurizing portions primary and secondary fuel flow to dual-line duplex fuel nozzles, and the dump portion allows fuel to drain from the manifolds after engine shutdown.
what purpose do fuel selector valves serve? they allow tank and engine selection, and provide a means for shutting off fuel flow.
what could happen to an oil that is too low in viscosity at normal engine operating temperatures? it may become so thin that the oil film between moving parts is easily broken resulting in premature wear.
name two types of turbine engine oil coolers. air cooled and fuel cooled.
Created by: Justin84
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