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Message: <blockquote data-quote="Speed Demon" data-source="post: 1713978" data-attributes="member: 375"><p>All EFI engines have a fuel regulator installed by default. The job of the fuel regulator is to ensure the fuel pressure in the fuel rail is constant. By having constant fuel pressure, this ensures constant suppy of fuel to the injectors. This has nothing to do with the <em>amount</em> of fuel supply.</p><p></p><p>The standard fuel regulator is non-adjustable. On performance vehicles, most people will modify the engine to allow for higher air-intake. So they must ensure that fuel supply also increases. Fitting an adjustable fuel regulator allows you to increase the fuel pressure in the fuel rail but whether it is rich or lean is not controlled by the fuel regulator.</p><p></p><p>You will need devices like Apexi SAFC to do this.</p></blockquote><p></p>

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