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Message: <blockquote data-quote="greyrex" data-source="post: 810487" data-attributes="member: 2194"><p>Most modern fuel injected cars run a fuel pump in the tank and run much more fuel than is needed to the fuel rail. A regulator keeps a certain amount of fuel pressure in the rail and then sends the rest back to the tank.Your car as well as most fuel injected cars have a one to one fuel regulator. It varies the fuel pressure by 'watching' manifold pressure. It uses a diaphragm to control pressure. If you further put pressure (turbo or super charger) to the manifold, it further increased fuel pressure. In factory regulators, for every pound of boost, it adds a pound of fuel psi. Hence 1 to 1.Most adjustable regulators are still one to one or close to that, however you can adjust the pressure at idle or full throttle for fine tuning.</p></blockquote><p></p>

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