Question 1

The amperage draw of an electric fuel pump is lower than specified. What is the most likely cause?

Accepted Answer

A)  Restriction in the fuel line 
B)  Stuck fuel pump impeller blades 
C)  Clogged fuel filter 
D)  Corroded electrical connections at the pump motor 
A)  Restriction in the fuel line 
B)  Stuck fuel pump impeller blades 
C)  Clogged fuel filter 
D)  Corroded electrical connections at the pump motor A

Question 2

Technician A says that fuel tank accident and rollover protection devices include check valves and inertia switches. Technician B says that most fuel lines are made of ABS plastic. 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 B 
A)  Technician A only 
B)  Technician B only 
C)  Both technicians A and B 
D)  Neither technician A nor B A

Question 3

How long does the electric fuel pump run if the ignition is turned on but the engine is not started?

Accepted Answer

A)  Until the ignition is turned off 
B)  5-10 minutes depending on vehicle 
C)  Five hundred milliseconds 
D)  A few seconds 
A)  Until the ignition is turned off 
B)  5-10 minutes depending on vehicle 
C)  Five hundred milliseconds 
D)  A few seconds D

Question 4

Some General Motors electric fuel pump circuits incorporate a(n) ________ that functions as a back-up circuit to energize the fuel pump relay.

Accepted Answer

A)  fuel Pressure Sensor 
B)  idling switch 
C)  oil Pressure Switch 
D)  feedback Sensor 
A)  fuel Pressure Sensor 
B)  idling switch 
C)  oil Pressure Switch 
D)  feedback Sensor

Question 5

Technician A says that a fuel tank is either constructed of steel with brass plating for corrosion resistance or of polyethylene plastic. Technician B says that some fuel tank filler tubes contain an anti-siphoning device. 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 B 
A)  Technician A only 
B)  Technician B only 
C)  Both technicians A and B 
D)  Neither technician A nor B

Question 6

Technician A says that a pressure check valve should hold system pressure for at least five minutes after the pump is shut off. Technician B says that a defective check valve could cause long cranking time. 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 B 
A)  Technician A only 
B)  Technician B only 
C)  Both technicians A and B 
D)  Neither technician A nor B

Question 7

The amperage draw of an electric fuel pump is higher that specified. What could be the cause?

Accepted Answer

A)  Clogged fuel filter 
B)  Defective fuel pump 
C)  Restriction in the fuel line 
D)  Any of the above 
A)  Clogged fuel filter 
B)  Defective fuel pump 
C)  Restriction in the fuel line 
D)  Any of the above

Question 8

Technician A says that electric fuel pump types include roller cell, gerotor, and turbine. Technician B says that fuel filters remove particles that are 10 to 20 microns or larger in size. 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 B 
A)  Technician A only 
B)  Technician B only 
C)  Both technicians A and B 
D)  Neither technician A nor B

Question 9

Fuel pump pressure is too low after engine start-up. Which of these could be the cause?

Accepted Answer

A)  Restricted fuel return line 
B)  Defective fuel pump rely 
C)  Excessive system voltage 
D)  Plugged fuel filter 
A)  Restricted fuel return line 
B)  Defective fuel pump rely 
C)  Excessive system voltage 
D)  Plugged fuel filter

Question 10

Which of these is the fuel pump?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
A)  A 
B)  B 
C)  C 
D)  D

Question 11

The electric fuel pump is usually mounted in which of these locations?

Accepted Answer

A)  Fuel Tank 
B)  In front of the starter motor 
C)  Just above the right rear tire well 
D)  Trunk near the spare tire 
A)  Fuel Tank 
B)  In front of the starter motor 
C)  Just above the right rear tire well 
D)  Trunk near the spare tire

Question 12

Technician A says that fuel filters are located in the fuel supply line. Technician B says that fuel filters are located in the fuel return line. 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 B 
A)  Technician A only 
B)  Technician B only 
C)  Both technicians A and B 
D)  Neither technician A nor B

Exam 21: Fuel Pumps, Lines, and Filters

The amperage draw of an electric fuel pump is lower than specified. What is the most likely cause?

Technician A says that fuel tank accident and rollover protection devices include check valves and inertia switches. Technician B says that most fuel lines are made of ABS plastic. Which technician is correct?

How long does the electric fuel pump run if the ignition is turned on but the engine is not started?

Some General Motors electric fuel pump circuits incorporate a(n) ________ that functions as a back-up circuit to energize the fuel pump relay.

Technician A says that a fuel tank is either constructed of steel with brass plating for corrosion resistance or of polyethylene plastic. Technician B says that some fuel tank filler tubes contain an anti-siphoning device. Which technician is correct?

Technician A says that a pressure check valve should hold system pressure for at least five minutes after the pump is shut off. Technician B says that a defective check valve could cause long cranking time. Which technician is correct?

The amperage draw of an electric fuel pump is higher that specified. What could be the cause?

Technician A says that electric fuel pump types include roller cell, gerotor, and turbine. Technician B says that fuel filters remove particles that are 10 to 20 microns or larger in size. Which technician is correct?

Fuel pump pressure is too low after engine start-up. Which of these could be the cause?

Which of these is the fuel pump?

The electric fuel pump is usually mounted in which of these locations?

Technician A says that fuel filters are located in the fuel supply line. Technician B says that fuel filters are located in the fuel return line. Which technician is correct?

The Diagnostic Process

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Engine and Misfire Diagnosis

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Starting and Charging System Diagnosis

Ignition System Operation and Diagnosis

Temperature Sensors

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Filters