Question 1

Which of these components is the EVAP system purge valve?

Accepted Answer

A)  A
B)  B
C)  C
D)  DE) B) and D)
F) None of the above

Question 2

All of the following can increase the pressure in the evaporative emission system EXCEPT ________.

Accepted Answer

A)  Fuel temperature
B)  Volatility of the fuel
C)  Returned fuel from the fuel injection system
D)  Inlet fuel to the fuel pumpE) A) and B)
F) A) and C)

Question 3

A fuel tank expansion chamber is designed to be what percentage of the tank capacity?

Accepted Answer

A)  2-5%
B)  25-30%
C)  10-20%
D)  None of theseE) B) and D)
F) A) and D)

Question 4

What polluting chemical compound is caused by evaporating gasoline?

Accepted Answer

A)  Carbon monoxide
B)  Ozone
C)  Hydrocarbons (VOCs) 
D)  None of theseE) All of the above
F) A) and C) C

Question 5

What makes activated charcoal ideal for trapping gasoline fumes?

Accepted Answer

A)  Large surface area
B)  High boiling point
C)  Low flash point
D)  None of theseE) A) and D)
F) B) and C)

Question 6

Evaporative emission control systems operate on low pressure measured in inches of water. One psi is equal to how many inches of water?

Accepted Answer

A)  10
B)  28
C)  1
D)  18E) None of the above
F) C) and D)

Question 7

Beginning with the 2000 model year, enhanced EVAP systems were introduced that can detect a leak as small as ________.

Accepted Answer

A)  0.040 in.
B)  0.020 in.
C)  0.002 in.
D)  None of theseE) A) and D)
F) B) and C)

Question 8

Two technicians are discussing a state emission test. Technician A says that a vent valve that is not able to close can cause the system to fail the on-board test. Technician B says that a leaking gas cap can cause a failure of the EVAP test. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) C) and D)
F) B) and C) C

Question 9

Inadequate purge flow rate will trigger which DTC?

Accepted Answer

A)  P0440
B)  P0440 or P0446
C)  P0446
D)  P0300E) A) and D)
F) All of the above

Question 10

Technician A says that low pressure smoke installed in the fuel system can be used to check for leaks.
Technician B says that nitrogen under low pressure can be installed in the fuel system to check for leaks. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) A) and B)
F) None of the above

Question 11

The canister vent valve is normally ________.

Accepted Answer

A)  Open
B)  ClosedC) A) and B)
D) undefined

Question 12

A small leak is detected by the evaporative emission control system monitor that could be caused by a loose gas cap. Which DTC will likely be set?

Accepted Answer

A)  P0442
B)  P0440, P0441, or P0442
C)  P0440
D)  P0446E) A) and D)
F) A) and C)

Question 13

What is the substance used in a vapor canister to absorb volatile organic compounds?

Accepted Answer

A)  Carbon
B)  Pleated paper
C)  Organic absorber
D)  DesiccantE) A) and B)
F) C) and D)

Question 14

A vehicle fails an emission test due to excessive carbon monoxide indicating a rich air fuel mixture.Technician A says that a saturated charcoal canister could be the cause. Technician B says that a stuck-closed EVAP purge solenoid could be the cause. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) None of the above
F) A) and B) A

Question 15

Which EVAP valve is subject to rust and corrosion more than all of the others?

Accepted Answer

A)  Vent valve
B)  Vacuum control valve
C)  Roll over check valve
D)  Purge valveE) B) and C)
F) A) and D)

Question 16

Technician A says that canister purging occurs during wide open throttle conditions. Technician B says that canister purging uses intake manifold vacuum to pull fuel vapors from the canister. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) B) and D)
F) B) and C)

Question 17

Technician A says that fuel filler caps with pressure and vacuum vents are used with EVAP system fuel tanks. Technician B says that using a non-vented cap on a system equipped with an evaporative emissions system may cause damage to the fuel tank. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) A) and B)
F) All of the above

Question 18

Enhanced EVAP systems that are able to detect fuel vapor leaks were mandated on all U.S. cars starting in ________.

Accepted Answer

A)  1994
B)  1974
C)  1983
D)  1996E) B) and C)
F) A) and D)

Exam 83: Evaporative Emission Control Systems

Which of these components is the EVAP system purge valve?

Correct Answer
verified

All of the following can increase the pressure in the evaporative emission system EXCEPT ________.

Correct Answer
verified

A fuel tank expansion chamber is designed to be what percentage of the tank capacity?

Correct Answer
verified

What polluting chemical compound is caused by evaporating gasoline?

Correct Answer
verified
C

What makes activated charcoal ideal for trapping gasoline fumes?

Correct Answer
verified

Evaporative emission control systems operate on low pressure measured in inches of water. One psi is equal to how many inches of water?

Correct Answer
verified

Beginning with the 2000 model year, enhanced EVAP systems were introduced that can detect a leak as small as ________.

Correct Answer
verified

Two technicians are discussing a state emission test. Technician A says that a vent valve that is not able to close can cause the system to fail the on-board test. Technician B says that a leaking gas cap can cause a failure of the EVAP test. Which technician is correct?

Correct Answer
verified
C

Inadequate purge flow rate will trigger which DTC?

Correct Answer
verified

Technician A says that low pressure smoke installed in the fuel system can be used to check for leaks. Technician B says that nitrogen under low pressure can be installed in the fuel system to check for leaks. Which technician is correct?

Correct Answer
verified

The canister vent valve is normally ________.

Correct Answer
verified

A small leak is detected by the evaporative emission control system monitor that could be caused by a loose gas cap. Which DTC will likely be set?

Correct Answer
verified

What is the substance used in a vapor canister to absorb volatile organic compounds?

Correct Answer
verified

A vehicle fails an emission test due to excessive carbon monoxide indicating a rich air fuel mixture.Technician A says that a saturated charcoal canister could be the cause. Technician B says that a stuck-closed EVAP purge solenoid could be the cause. Which technician is correct?

Correct Answer
verified
A

Which EVAP valve is subject to rust and corrosion more than all of the others?

Correct Answer
verified

Technician A says that canister purging occurs during wide open throttle conditions. Technician B says that canister purging uses intake manifold vacuum to pull fuel vapors from the canister. Which technician is correct?

Correct Answer
verified

Technician A says that fuel filler caps with pressure and vacuum vents are used with EVAP system fuel tanks. Technician B says that using a non-vented cap on a system equipped with an evaporative emissions system may cause damage to the fuel tank. Which technician is correct?

Correct Answer
verified

Enhanced EVAP systems that are able to detect fuel vapor leaks were mandated on all U.S. cars starting in ________.

Correct Answer
verified

Exam 83: Evaporative Emission Control Systems

Which of these components is the EVAP system purge valve?

Correct AnswerverifiedShow Answer

All of the following can increase the pressure in the evaporative emission system EXCEPT ________.

Correct AnswerverifiedShow Answer

A fuel tank expansion chamber is designed to be what percentage of the tank capacity?

Correct AnswerverifiedShow Answer

What polluting chemical compound is caused by evaporating gasoline?

Correct AnswerverifiedC

What makes activated charcoal ideal for trapping gasoline fumes?

Correct AnswerverifiedShow Answer

Evaporative emission control systems operate on low pressure measured in inches of water. One psi is equal to how many inches of water?

Correct AnswerverifiedShow Answer

Beginning with the 2000 model year, enhanced EVAP systems were introduced that can detect a leak as small as ________.

Correct AnswerverifiedShow Answer

Two technicians are discussing a state emission test. Technician A says that a vent valve that is not able to close can cause the system to fail the on-board test. Technician B says that a leaking gas cap can cause a failure of the EVAP test. Which technician is correct?

Correct AnswerverifiedC

Inadequate purge flow rate will trigger which DTC?

Correct AnswerverifiedShow Answer

Technician A says that low pressure smoke installed in the fuel system can be used to check for leaks. Technician B says that nitrogen under low pressure can be installed in the fuel system to check for leaks. Which technician is correct?

Correct AnswerverifiedShow Answer

The canister vent valve is normally ________.

Correct AnswerverifiedShow Answer

A small leak is detected by the evaporative emission control system monitor that could be caused by a loose gas cap. Which DTC will likely be set?

Correct AnswerverifiedShow Answer

What is the substance used in a vapor canister to absorb volatile organic compounds?

Correct AnswerverifiedShow Answer

A vehicle fails an emission test due to excessive carbon monoxide indicating a rich air fuel mixture.Technician A says that a saturated charcoal canister could be the cause. Technician B says that a stuck-closed EVAP purge solenoid could be the cause. Which technician is correct?

Correct AnswerverifiedA

Which EVAP valve is subject to rust and corrosion more than all of the others?

Correct AnswerverifiedShow Answer

Technician A says that canister purging occurs during wide open throttle conditions. Technician B says that canister purging uses intake manifold vacuum to pull fuel vapors from the canister. Which technician is correct?

Correct AnswerverifiedShow Answer

Technician A says that fuel filler caps with pressure and vacuum vents are used with EVAP system fuel tanks. Technician B says that using a non-vented cap on a system equipped with an evaporative emissions system may cause damage to the fuel tank. Which technician is correct?

Correct AnswerverifiedShow Answer

Enhanced EVAP systems that are able to detect fuel vapor leaks were mandated on all U.S. cars starting in ________.

Correct AnswerverifiedShow Answer

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C

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C

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A

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