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motorhead motorhead
wrote...
Posts: 6002
5 years ago
Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines?
A) To lower the fuel pressure under heavy engine load conditions to help improve fuel economy
B) To draw fuel back into the intake manifold through the vacuum hose
C) To raise the fuel pressure at idle
D) To create an equal pressure drop across the injectors
Textbook 

Automotive Technology


Edition: 4th
Author:
Read 441 times
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mag90simag90si
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5 years ago
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