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Copyright by The Goodheart-Willcox Co., Inc. 239
Name _________________________________________________________________________ Date _________________________
Instructor _____________________________________________________________________ Score ________________________
Chapter40hapterapter
Objective: After studying this chapter, you will be able to describe and explain the components, operations, construction, and service procedures of modern automotive fuel supply systems.
Fuel Supply System 1. A fuel system must provide a(n) _____ air-fuel mixture _________________________________________________
to power the engine.
2. Name and explain the three subsystems of a modern fuel system.
(A) ____________________________________________________________________________________________________
_______________________________________________________________________________________________________
(B) ____________________________________________________________________________________________________
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(C) ____________________________________________________________________________________________________
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3. Modern vehicles use _____ and _____ fuel pumps in _________________________________________________ .mednat _________________________________________________
4. List and explain the basic parts of a fuel supply system.
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5. What term describes the distance a vehicle can be driven without stopping for fuel?
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Fuel Tanks, Pumps, Lines, and Filters
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240 Modern Automotive Technology Workbook
6. Automotive fuel tanks are normally made of what materials?
_______________________________________________________________________________________________________
7. The fi ller _____ is the extension tube that allows the _________________________________________________gas pump nozzle to be used to fi ll the tank with fuel.
8. Defi ne spillback ball.
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9. Describe the purpose of fuel tank baffl es.
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10. Fuel tank _____ are used to secure the tank to the vehicle. _________________________________________________
11. Explain the operation of a tank pick-up sending unit.
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12. Explain the function of a fuel tank pressure sensor.
_______________________________________________________________________________________________________
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Copyright by The Goodheart-Willcox Co., Inc.
Chapter 40 Fuel Tanks, Pumps, Lines, and Filters 241
Name _________________________________________________________________________
13. Identify the basic parts of the fuel tank assembly.
L
G
E F
H
D
C
B
A
J K
Q
M
N
O
PR
I
(A) _____________________________________________
(B) ______________________________________________
(C) _____________________________________________
(D) _____________________________________________
(E) ______________________________________________
(F) ______________________________________________
(G) _____________________________________________
(H) _____________________________________________
(I) ______________________________________________
(J) ______________________________________________
(K) _____________________________________________
(L) ______________________________________________
(M) _____________________________________________
(N) _____________________________________________
(O) _____________________________________________
(P) ______________________________________________
(Q) _____________________________________________
(R) ______________________________________________
14. Fuel lines are normally made of what materials?
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
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15. A fuel _____ is a large-diameter fuel line that feeds fuel _________________________________________________to the inlet openings of the fuel injectors.
16. Fuel _____ are needed where severe movement occurs _________________________________________________between fuel system parts.
17. Hose _____ secure fuel hoses to fuel lines or metal _________________________________________________fi ttings.
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242 Modern Automotive Technology Workbook
18. Describe the function of a fuel return system.
_______________________________________________________________________________________________________
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_______________________________________________________________________________________________________
19. Explain the purpose of fuel fi lters.
_______________________________________________________________________________________________________
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20. Where are fuel fi lters normally located in an automotive fuel system?
_______________________________________________________________________________________________________
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21. What is the most common fuel fi lter element found in gasoline fuel systems?
_______________________________________________________________________________________________________
22. What type of fuel fi lter can be found on modern diesel engines?
_______________________________________________________________________________________________________
23. Name three locations where a fuel fi lter may be found.
_______________________________________________________________________________________________________
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24. Describe the function of a fuel pump.
_______________________________________________________________________________________________________
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25. A(n) (mechanical, electric) _____ fuel pump is a low- _________________________________________________pressure feed pump inside the fuel tank or in series with a fuel line.
26. A(n) (mechanical, electric) _____ fuel pump is a high- _________________________________________________pressure fuel pump mounted on the engine.
27. A mechanical fuel pump is usually powered by a(n) ______________________________________________________ on the engine camshaft.
28. Mechanical fuel pumps can still be found on _____-type _________________________________________________fuel systems.
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Chapter 40 Fuel Tanks, Pumps, Lines, and Filters 243
Name _________________________________________________________________________
29. Name the two types of check valves used in mechanical fuel pumps.
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
30. During the fuel pump (pressure, charging) _____ stroke, _________________________________________________the eccentric lobe pushes on the mechanical fuel pump rod and plunger.
31. On the fuel pump (pressure, charging) _____ stroke, the _________________________________________________eccentric lobe rotates away from the fuel pump.
32. Describe the function of a fuel pump gasket.
_______________________________________________________________________________________________________
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________ 33. Fuel pump pressures can reach as high as _____ psi.(A) 100(B) 500(C) 1000(D) 2000
34. Where is an electric fuel pump normally located?
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35. Explain some of the advantages an electric fuel pump has over a mechanical pump.
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For questions 36–39, match the following terms and identifying phrases.
(A) Impeller electric fuel pump(B) Roller vane electric fuel pump(C) Sliding vane electric fuel pump(D) Reciprocating electric fuel pump
________ 36. Uses square vanes instead of round rollers.
________ 37. Uses a solenoid instead of a rocker arm.
38. A centrifugal pump.
________ 39. A positive-displacement pump.
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244 Modern Automotive Technology Workbook
40. The _____ in a rotary electric fuel pump keep fuel from _________________________________________________draining out of the fuel line when the pump is not running.
41. What limits maximum output pressure in a rotary electric fuel pump?
_______________________________________________________________________________________________________
42. An inertia _____ cuts electric fuel pump power in the _________________________________________________event of a serious auto collision or accident.
43. Name the safety feature that protects the engine from damage by shutting off the fuel pump if the oil pressure is low.
_______________________________________________________________________________________________________
44. True or False? A leaking tank should be welded or _________________________________________________soldered.
45. Identify the components shown below.
F
G
H
J
ID
K
C
BA
Engine
E
(A) _____________________________________________
(B) ______________________________________________
(C) _____________________________________________
(D) _____________________________________________
(E) ______________________________________________
(F) ______________________________________________
(G) _____________________________________________
(H) _____________________________________________
(I) ______________________________________________
(J) ______________________________________________
(K) _____________________________________________
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Copyright by The Goodheart-Willcox Co., Inc.
Chapter 40 Fuel Tanks, Pumps, Lines, and Filters 245
Name _________________________________________________________________________
Fuel Supply System Service 46. Why is a scan tool helpful when servicing a fuel supply system?
_______________________________________________________________________________________________________
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47. Defi ne vapor lock.
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48. Name some typical fuel tank problems.
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49. Describe the procedures used to remove an automotive fuel tank.
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50. What normally is the cause of a faulty fuel tank sending unit?
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51. Explain how to remove a fuel tank sending unit.
_______________________________________________________________________________________________________
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246 Modern Automotive Technology Workbook
52. Some late-model fuel lines have a(n) _____ -type fi tting. _________________________________________________
53. List and explain at least three of the rules you should remember when working with fuel lines and hoses.
(A) ____________________________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
(B) ____________________________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
(C) ____________________________________________________________________________________________________
_______________________________________________________________________________________________________
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54. How can a clogged fuel fi lter affect engine operation?
_______________________________________________________________________________________________________
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55. Some fuel fi lters have a(n) _____ that opens when the _________________________________________________fi lter becomes clogged.
56. _____ fuel pump pressure can be caused by worn pump _________________________________________________bearings, high resistance in electric pump circuit, leaking check valves, or physical wear of moving parts.
57. _____ fuel pump pressure is commonly caused by an _________________________________________________inoperative pressure relief valve.
58. What are the usual causes of mechanical fuel pump noise?
_______________________________________________________________________________________________________
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59. What normally causes fuel pump leaks?
_______________________________________________________________________________________________________
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60. Fuel pump testing commonly involves measuring fuel _________________________________________________pump _____ and _____. _________________________________________________
61. Name three things that can be checked with a scan tool.
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
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Copyright by The Goodheart-Willcox Co., Inc.
Chapter 40 Fuel Tanks, Pumps, Lines, and Filters 247
Name _________________________________________________________________________
62. Name two things that can cause a fuel pump to fail.
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
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63. Describe how to measure fuel pump pressure.
_______________________________________________________________________________________________________
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64. What should be the fuel pressure for a diesel supply pump?
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65. Describe how to check fuel pump volume.
_______________________________________________________________________________________________________
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66. Fuel pump _____ should be checked when a fuel pump _________________________________________________fails pressure and volume tests.
67. Explain how to measure fuel pump vacuum.
_______________________________________________________________________________________________________
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_______________________________________________________________________________________________________
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248 Modern Automotive Technology Workbook
68. Name some problems that can affect electric fuel pump operation.
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
69. Label the components and testing instruments in the following illustration depicting a fuel pump voltage supply test.
~V
OFF
VΩ
mA
mAA ~
12V
A
F
DC
BE
(A) _____________________________________________
(B) ______________________________________________
(C) _____________________________________________
(D) _____________________________________________
(E) ______________________________________________
(F) ______________________________________________
70. A(n) _____ can be used to block current fl ow to the _________________________________________________electric fuel pump after a severe impact or collision.
71. A(n) _____ switch in the circuit signals the ECM to shut _________________________________________________off the electric fuel pump if engine oil pressure drops too low.
72. Describe how to remove a mechanical fuel pump.
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
73. Explain how to remove an inline electric fuel pump.
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
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74. What is the function of an air fi lter?
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
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