Quote:
Originally Posted by chrisfrank
I understand one of the gas lines is an outlet from the pump and the other one is a return line to the tank. Is that right? Which one is the high pressure feed line? How does that work anyway?
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The lower line is the feed line. Upper is return. They're both under pressure though, so it could still be either one.
The fuel pump runs all the time. High pressure fuel goes to the fuel pressure regulator, where it is sent to the injectors. Excess fuel comes back to the tank via the return line.