Gas Direct Injection

A gasoline direct injection system can be used to start an engine without the need for a starter.

-True

-False

• True

• False

GDI fuel injectors operate under a pressure of about ________.

-500 to 2,900 PSI

-35 to 45 PSI

-90 to 150 PS

-I2,000 to 5,000 PSI

• 500 to 2,900 PSI

• 35 to 45 PSI

• 90 to 150 PSI

• 12,000 to 5,000 PSI

Some engines that use a gasoline direct injection system also have port injection.

-True

-False

• True

• False

The fuel injectors used on a gasoline direct injection system are pulsed on using what voltage?

-100 to 110 V

-12 to 14 V

-50 to 90 V

-200 to 220 V

• 100 to 110 V

• 12 to 14 V

• 50 to 90 V

• 200 to 220 V

The fuel pump inside the fuel tank on a vehicle equipped with gasoline direct injection produces about what pressure?

-50 to 60 PSI

-10 to 20 PSI

-5 to 10 PSI

-20 to 40 PSI

• 50 to 60 PSI

• 10 to 20 PSI

• 5 to 10 PSI

• 20 to 40 PSI

The high-pressure fuel pressure is regulated by using ________.

-A mechanical regulator at the inlet to the fuel rail

-A vacuum-biased regulator

-A non-vacuum-biased regulator

-An electric pressure control valve

• A mechanical regulator at the inlet to the fuel rail

• A vacuum-biased regulator

• A non-vacuum-biased regulator

• An electric pressure control valve

The high-pressure fuel pump used in gasoline direct injection (GDI) systems is powered by ________.

-The crankshaft

-The camshaft

-Electricity (AC motor)

-Electricity (DC motor)

• The crankshaft

• The camshaft

• Electricity (AC motor)

• Electricity (DC motor)

When the fuel pressure regulator is deactivated, the fuel pressure defaults to ________.

-Low pressure mode

-High pressure mode

-Acceleration mode

-60 PSI

• Low pressure mode

• High pressure mode

• Acceleration mode

• 60 PSI

Where is the fuel injected in an engine equipped with gasoline direct injection?

-Above the intake port

-In the exhaust port

-Into the intake manifold near the intake valve

-Directly into the combustion chamber

• Above the intake port

• In the exhaust port

• Into the intake manifold near the intake valve

• Directly into the combustion chamber

Which mode of operation results in a richer air-fuel mixture near the spark plug?

-Stoichiometric

-Homogeneous

-Knock protection

-Stratified

• Stoichiometric

• Homogeneous

• Knock protection

• Stratified