Four Stroke Engine: Fuel System (iCEV) - Lindsey S Davie | Biblioteka

1

With the addition of alcohol to gasoline and changes to refinery processes, power equipment manufacturers do NOT recommend storing fuel for more than what length of time?

Two months

Six months

30 days

Three weeks

1

Which of the following is considered a mid-grade gasoline?

Octane rating equal to 88 and less than or equivalent to 90

Octane rating equal to 85 and less than 88

Octane rating greater than 90

Octane rating equal to 86 and less than or equivalent to 88

1

Gasoline’s ability to become a vapor correctly defines which of the following terms?

Distillation

Converter

Vapor Lock

Volatility

1

Which of the following is NOT a benefit of alcohol-based fuels as mentioned in the presentation?

Less carbon deposits

Improves emissions

Boosts octane

Decreases U.S. dependency on imported oil

1

Which fuel contained more power in our lab?

ethanol (alcohol based fuel)

kerosene (petroleum based fuel)

1

Which fuel produced the most soot?

ethanol (alcohol based fuel)

kerosene (petroleum based fuel)

1

What are carburetors used for?

To clean fuel

To combine gasoline and air

To increase octane ratings

To decrease octane ratings

1

What is the purpose of the float assembly?

To deliver fuel to the carburetor

To allow fuel to enter the fuel bowl

To hold fuel for metering circuits

To control the level of fuel in the fuel bowl

1

Which of the following accurately describes the venturi effect?

The reduction in pressure resulting in fluid being forced through a constricted passage

When the fuel is allowed to enter the engine at wide open throttle

When fuel is prevented from flowing through the carburetor

The increase in ambient temperature resulting in loss of control

1

Which of the following exist to limit afterbang after the engine is turned off?

Automatic choke

Fuel enrichment

Pickup tubes

Fuel solenoids

1

Select the appropriate choice.

	Choke	Throttle
Left (6)
Right

1

What type of operation is this carburetor in based off of the choke and throttle?

idling

starting

full throttle/high speed

part throttle

1

Where is pressure the lowest?

top

middle

bottom

1

Which of the following is the most common type of fuel delivery method used to get fuel from the fuel tank to the EFI system?

Electric

Mechanical

Vacuum

Pulse

1

What is the purpose of fuel injectors?

To control the fuel pressure and return excess fuel to the tank

To atomize the fuel into a mist for better combustion

To distribute the air/fuel mixture to the cylinders

To remove particles found in the fuel to prevent damage

1

Which of the following are usually found in the form of a screen basket?

Temperature sensors

Pressure regulators

Fuel injectors

Pre-tank filters

1

ECU is the acronym for which of the following?

Engine control unit

External computing undertake

Engine calculation understanding

External compression unit

1

Which of the following sensors provides the ECU with a signal for determining engine load?

Crankshaft position sensor

Inlet air temperature (IAT) sensor

Oxygen sensor

Manifold absolute pressure (MAP) sensor

1

Which of the following sensors allows the ECU to increase or decrease the fuel mixture and spark timing to adjust for deceleration, acceleration and changes in load?

Throttle position (TPS) sensor

Oxygen sensor

Engine temperature (ET) sensor

Inlet air temperature (IAT) sensor

1

Where can the oxygen sensor be installed?

muffler

cylinder head

oil pan

coolant system

1

Which of the following only functions after warming up to the operating temperature?

Engine temperature (ET) sensor

Throttle position (TPS) sensor

Oxygen sensor

Manifold absolute pressure (MAP) sensor

1

Which of the following is the optimum air/fuel ratio for a gasoline engine?

14.5:1

15.4:2

14.7:1

13.7:1

1

A large increase in elevation can cause a carbureted engine to run ________ if not properly adjusted for the altitude.

in circles

lean

backward

rich

1

Match each component with its function.

	Holds fuel for use by different metering circuits	Controls the level of fuel in the bowl	Delivers fuel to the throat of the carburetor	Where fuel enters the carburetor from the fuel tank	Maintains the air pressure at atmospheric levels	Allows fuel to enter the float bowl as it is consumed
Fuel supply inlet
Fuel bowl
Fuel bowl vent
Float assembly
Inlet needle
Pickup tube

1

EFI is the acronym for which of the following?

Engine Faulty Incoming

Engine Fuel Ignition

Electronic Fuel Injection

Electric Filter Injection

1

Put the steps of the “shaker test” in order.

Read the alcohol percentage level
Add fuel to the top mark
Let the solution sit for three to five minutesAdd fuel to the top mark
Shake vigorously
Let the solution sit for three to five minutes

1

How can fuel become oxidized?

Becoming too cold

Exceeding its shelf life

Becoming too hot

Being to lean

1

Altering the air/fuel ration due to an increase in alcohol is known as which of the following?

Phase separation

Degreasing

Corrosion

Enleanment

1

Ethanol is ____________ oxygen.

37.6%

39.2%

42.1%

43.4%