Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines?
A) To create an equal pressure drop across the injectors
B) To draw fuel back into the intake manifold through the vacuum hose
C) To raise the fuel pressure at idle
D) To lower the fuel pressure under heavy engine load conditions to help improve fuel economy
A
You might also like to view...
Similar to the human knee, the ____________________ is right above the hind leg and connects the femur to the tibia.
Fill in the blank(s) with the appropriate word(s).
Open-loop, water-source heat pump systems involve the transfer of heat between a water source and the air or water being circulated to a(n) ____________________ space.
Fill in the blank(s) with the appropriate word(s).
The vehicle instrumentation systems monitor various vehicle operating systems.
Answer the following statement true (T) or false (F)
When an open occurs on the input to a bipolar logic device, the output will ________
A) go LOW, because there is no current in an open circuit B) go HIGH, since full voltage appears across an open C) react to the open input as if it were a HIGH input D) still be good, if only the good inputs are used