Fuel Flashcards
What is fuel metering?
Is the adjustment of the fuel input based on the air intake
What are the standard mixture ratios?
Rich = 8:1
Lean = 16:1
What does the float device do?
Controls the level of fuel in the float bowl
__________ _________ _____________ is more useful for acrobatic fighter airplanes
______ _________ _________ is used to eliminate the drawbacks of carburetors
Fuel Injection System
Fuel ______/_____ provides provision for draining/sampling
Strainer/bowl
On the mixture control, how do you achieve full rich and full idle?
Full Rich-Push Forward on Knob
Idle Cutoff-Pull mixture control aft
As aircraft climbs, you heve to ______ mixture
Lean
_________ = Uncontrolled combustion, usually caused by using fuel with too low octane
Detonation
Hot spots cause ____ - ________
Pre-Ignition
__________: Ignition of fuel inside the induction system caused by very lean mixture burning
Backfire
___________ is caused by unburned fuel mixing with air in exhaust and reigniting, usually a sign of excessively rich mixture
Afterfire
The _____ _______ is known as a last chance fuel filter
Inlet Screen
_____ & ______ _______ opens and closes to allow or stop fuel into float bowl
Seat & Needle Valve
During Idle, sometimes the venturi effect isn’t strong enough, and relies on ______ _________. There are also holes upstream used to add fuel to the engine
Engine Suction
In automatic mixture control, ______ _________ reacts to atmospheric air pressure changes to drive the ________ ________
Sealed Bellows, Variable Orafice
__________ _______ is used during rapid engine acceleration, preventing mixture from leaning out as the venturi effect catches up
Accelerator pump
______ ________ _________ represrents the air pressure above the surface of the fuel required to prevent evaporation
Reid Vapour Pressure
To promote a fine spray pattern, a ________ _____ _______ is installed beside the main discharge nozzle and below the fuel level in the float bowl to break surface tension
Metered Air Bleed
Carburetor is limited to: _______ and ______ _____
Weather, Carb Ice
R Question: Where in the carb does the discharge nozzle sit?
In the thinnest point of the venturi
R Question: How do we shut the engine off?
Starve engine of fuel (Mixture to idle cutoff)
R Question: How do mags assist on startup?
Through the use of Impulse couplers
Low operating pressures can result in _________ __________ of fuel
incomplete vaporization
