Author Question: Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines? A) ... (Read 167 times)

jjjetplane · **on:** Jun 22, 2018

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

Question 2

The pulse generator ________.

A) Signals the electronic control unit (module)
B) Signals the computer that fires the spark plug directly
C) Fires the spark plug directly
D) Is used as a tachometer reference signal by the computer and has no other function