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Message: <blockquote data-quote="Walbro" data-source="post: 3367074" data-attributes="member: 70641">the walbro 255 lph mostly used when ur car are upgrading to stage 2 or higher mod. without any mods like FPR and management that can help stabilize the tuning, the fuel pressure will tend to go higher after installing Walbro FP. some of the tuners will use 190 lph walbro to avoid too much fuel feed into the engine. but for your own good, it is better for you to buy any management that can fine tune the air fuel ratio and FPR (fuel pressure regulator). oh yeah, after you install the FPR (with a gauge), make sure that the fuel pressure don't drop instantly to 0 psi after shutting off the car (at least 30 minutes). this symptoms shows that there are leak in the fuel line (the walbro feed high pressure fuel). Most of the tuners that install FPR will change the fuel line to avoid the fuel line from being kinked because of high pressure fuel.</blockquote>

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