Exam 27: Heui Fuel Systems

What does an injection pressure regulator (IPR) valve control?

(Multiple Choice)

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Question 41

How are HEUIs supplied hydraulically by fuel charging pressure?

(Multiple Choice)

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Question 42

Which company manufacturers HEUI injectors for current (post-2010) Navistar engines?

(Multiple Choice)

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Question 43

When a HEUI control solenoid is energized, which of the following passages is immediately closed off within the HEUI?

(Multiple Choice)

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Question 44

Technician A says that actuation oil pressure always exceeds the fuel injection pressures in a HEUI fuel system. Technician B says that actuation oil pressure in the cylinder head gallery exceeds the fuel charging pressure by a wide margin. Who is correct?

(Multiple Choice)

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Question 45

Showing 41 - 45 of 45

Exam 27: Heui Fuel Systems

What does an injection pressure regulator (IPR) valve control?

How are HEUIs supplied hydraulically by fuel charging pressure?

Which company manufacturers HEUI injectors for current (post-2010) Navistar engines?

When a HEUI control solenoid is energized, which of the following passages is immediately closed off within the HEUI?

Technician A says that actuation oil pressure always exceeds the fuel injection pressures in a HEUI fuel system. Technician B says that actuation oil pressure in the cylinder head gallery exceeds the fuel charging pressure by a wide margin. Who is correct?

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