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Old 07-12-2008, 10:57 AM   #18
Scooby Specialist
Member#: 124060
Join Date: Aug 2006
Location: Bloomfield Michigan
2004 WRX STI


Originally Posted by srREXed View Post
Why would the fuel after step 5 exit into a fuel pressure regulator if it is being returned to the tank?

The regulator is what regulates fuel pressure. It acts as a restriction,... and restriction to flow is what causes pressure.

If it were before the injectors,..there wouldn't be much of any pressure AT the injectors. So the fuel goes from the pump to the rails, past the injectors..then to a variable restriction (regulator). And the leftover goes back to the tank.
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