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Re: how does the fuel pressure regulator work? Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Tue, 11 Apr 2006 10:17:29 In Reply to: how does the fuel pressure regulator work?, Bryan [Profile/Gallery] , Tue, 11 Apr 2006 10:05:02 Members do not see ads below this line. - Help Keep This Site Online - Signup |
A 'normal' FPR increases fuel pressure at a 1:1 ratio with inlet pressure. At high vacuum, fuel is essentially 'pulled' into the cylinder; therefore the FPR drops the fuel pressure. So at higher intake pressures, the FPR increases the fuel pressure. This keeps the pressure drop across the injector (pressure side, cylinder side) constant with differences in intake pressure. For a given injector open time ,you get the same amount of fuel.
A rising rate FPR increases fuel pressure at a higher rate than 1:1. So as the intake pressure increases, the FPR increases fuel pressure more. So you end up with a larger pressure difference across the injector; so for a given injector opening time, you get more fuel at higher intake pressure. Since higher intake pressure is usually assocated with the throttle being wider open, you get more fuel under high demand conditions.
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