Quote:
Originally Posted by Ferdman
Professor, as far as I know that line running from the fuel pressure regulator to the breather hose is a vent line. If the FPR diaphragm fails it directs leaking fuel to the valve cover to prevent an under-hood fire.
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It serves as a vent line in case of failure but when operating I think it may actually help the regulator figure out it's reference to regulate pressure by comparing the fuel pressure to that of the manifold. I might be wrong but that's my guess.