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Posted for "sqpilot@earthlink" <sqpilot@earthlink.net>:
Paul, the usual EFI plumbing has the regulator as the last point on the
fuel rails. The return port should be on the regulator itself. Yes, you absolutely need a separate return port on your fuel tank.
I have no idea what the 90- degree pipe is on your injectors. Never saw one like that before.
Tracy<<<<
Hi, Tracy. Thanks for the response. I made an error. The injectors that I was referring to came with my 13B as I originally purchased it. It had an Performance Airflow throttle body, and seperate injectors that had the 90 degree fuel returns off them. I am not using that system now. Dave Atkin's system has injectors without the 90 degree return, and the two injectors in the housing also do not have the 90 degree returns. I have seen the same type injectors with the 90 degree returns on an IO360 Lycoming a friend of mine has. If you like, I can take a picture of one. I believe I have a better understanding of the EFI now, thanks to you. I assume my pressurized fuel line will enter on one side of the fuel rail, and the opposite end will have the fuel pressure regulator, with a return to my sump tank. It would seem that a setup like that would only have the fuel pressure regulator regulate the fuel pressure returning to the tank, whereas if I brought the pressureized line to the regulator first, it would regulate the pressure to the injectors. Do I understand you correctly that the fuel returning to the tank is what gets regulated by the fuel pressure regulator? Thanks again for your invaluable information. Hope to see you at Sun-N-Fun. Paul Conner
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