Lesson 7: Fuels And Fuel Systems. Fuels And Fuel Systems. Fuel: The energy source for the combustion process Combustion occurs when fuel comes into contact with oxygen, and the temperature of the mixture is raised to its kindling point.
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Lesson 7: Fuels And Fuel Systems
What air - fuel mixture would be used to produce the most power?
Pounds of fuel burned per hour
Brake horsepower produced
Reciprocating Engine Fuels
(grade = octane)
Fuel Metering Systems
As the velocity of a gas or liquid increases, the pressure decreases.
Fuel Metering Force
Varies the pressure in the float chamber between atmospheric and a pressure slightly below atmospheric.
Changes the size of the opening between the float bowl and the discharge nozzle.
Back Suction Mixture Control
Variable Orifice Mixture Control
of the throttle valve and
above the valve is low.
due to the low pressure
above the throttle valve.
bowl at idle and
discharges it through
the pump discharge
when the throttle is
Fuel Injection Systems