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So having a problem with rb25 det neo, it's in an r31. Narrowed it down to a fuel issue. With fuel line off the pump going to the side of the fuel rail without the pressure regulator. The car won't run at all as it'd not getting any fuel. So I switched the fuel lines over just to see what would happen, and the car runs (well only just idles won't rev up) until I block off the return fuel line. I can get it to rev properly. The return line had constant flow. And it's the wrong way round for the fuel lines. Any one have any ideas what is going on.

Picture is of my fuel lines

post-86720-0-43524900-1363327276_thumb.jpg

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https://www.sau.com.au/forums/topic/421710-rb25det-neo-fuel-issues/
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