Fuel Injection System (Additional Concepts)

Question 1

provide a reliable means of metering fuel for an engine but have two major limitations

Answer 1

carburetors

Question 2

two major limitations of carburetors

Answer 2

• fuel-air mixture is not evenly distributed to the cylinders of carbureted engine
• susceptible to carburetor icing

Question 3

when fuel is injected directly into the combustion chamber, the injection system is referred to as a ___________.

Answer 3

direct fuel injection system

Question 4

this type of fuel injection system was used on early radial engines and offered the benefits of even fuel distribution and a reduced chance of backfiring

Answer 4

direct fuel injection system

Question 5

forces the metered fuel directly into the combustion chambers of the individual cylinders in timed, high-pressure spurts

Answer 5

pumps

Question 6

the most common type of fuel injection system in reciprocating aircraft engines

Answer 6

continuous-flow injection system or indirect fuel injection

Question 7

In an indirect fuel injection system, it varies the pressure of fuel according to airflow to engine.

Answer 7

throttle-metering valve

Question 8

Mixture strength is varied by a manually operated ________, which adjusts the fuel pressure for altitude or operating conditions, as necessary.

Answer 8

mixture control valve

Question 9

This valve is also used to cut off the fuel supply when stopping the engine.

Answer 9

mixture control valve

Question 10

Main Components of an Indirect Fuel Injection System

Answer 10

• fuel pump
• fuel/air control unit
• fuel manifold valve
• discharge/injector nozzles
• throttle valve
• fuel pressure gauge

Question 11

fuel pump used for engine priming and starting and can flow independently from the other fuel pump

Answer 11

electric fuel pump

Question 12

fuel pump used for cases of malfunction of engine driven pump

Answer 12

electric fuel pump

Question 13

Components of Fuel/Air Control Unit

Answer 13

• throttle valve
• mixture control valve
• fuel metering valve

Question 14

connected to the pilot’s throttle lever and controls the airflow to the engine

Answer 14

throttle valve

Question 15

it is connected to the pilot’s mixture control lever and bleeds off fuel pressure applied to the metering fuel valve

Answer 15

mixture control valve

Question 16

The ________ can also close completely acting as the Idle Cut Off Valve.

Answer 16

mixture control valve

Question 17

mechanically connected to the throttle valve

Answer 17

fuel metering valve

Question 18

controls fuel flow coming from the mixture control valve to the fuel manifold valve according to the position of the throttle valve

Answer 18

fuel metering valve

Question 19

central point for distributing metered fuel to the engine

Answer 19

fuel manifold valve

Question 20

located in each cylinder head, with its outlet directed into the inlet port

Answer 20

discharge nozzles