Created By:	Albert Aviles (djbounce99)	Category:	Engine
Date Posted:	02-07-05	Views:	1870
Title:	Accel Adj. FPR Installation & Air/Fuel Tuning
Article:	* Purchase an Accel Adjustable Fuel Pressure Regulator Part #74565 * You'll also need an Air/Fuel Gauge; can Be mountable on gauge-pod or external. I would recommend an external; MSD Rich/Lean Indicator or Edelbrock's Rich/Lean Indicator. It's much easier to tune your fuel with an external while under your hood. I've also realized this project is much easier when the A/C has been removed & the intake manifold does not need to be removed. - Adjustable Fuel Pressure Installation - * Before starting anything, make sure you have 2 O rings for the FPR; 1 for the Fuel-Rail, 1 for the Return Line. The FPR only comes with 1 for the Fuel-Rail. * Relieve the fuel pressure; simply by removing your Fuel Pump Relay & starting your car. * Once your vehicle dies you may begin. * Remove the bracket that supports your intake manifold on the cam gear side. It's 12mm on the lower bolt which can be removed with an open-end wrench. I believe it's 11mm on the top bolt. * Once removed, you may use a shorten open-end 23/24mm wrench or large vise-grip pliers to loosen the bolt that connects the return line into the FPR. It's a little difficult to loosen the bolt because of lack of space but once loosen everything else is easy-street from there. I used vise-grip pliers and noticed that after every half-turn of the bolt, I had to stop & turn the pliers upside down. This will need to be continued until it's loose enough to turn by hand. Don't remove it yet. * Next, take the correct size torx key, attach to a small ratchet & small ratchet extension and now loosen the only bolt that holds down the FPR. * Remove the bolt & put it aside, don't lose it! * Now remove the bolt holding the return line & pull off the return line from the FPR. * Fuel will only run for a few seconds * Now remove the FPR. You may need to twist it side-to-side while pulling on it. If it still does not come off then use a medium size screwdriver and slowly pry it out. Pry it out slowly front to back of the FPR. * Once removed, fuel will only run for a few seconds. * Inspect and make sure the old O rings are not in the fuel-rail/return line & only inside the old FPR. * Remove your new FPR from the box & set it aside. * Take some fresh motor oil & soak the O ring that is attached to the Accel FPR that connects to the fuel rail. * Now soak the 2nd O ring in fresh motor oil * Insert that O ring into the opening for the return line in the FPR * Use a small flat-head screwdriver to press down on the O ring until it's all the way down & flat. * Install the new FPR into the fuel-rail, don't push it all the way back in yet. * Connect the return line into the FPR, hand tighten it tightly. * Push the FPR all the way back in. Make sure it goes all the way down on both sides. * Insert Torx holddown bolt to FPR, don't tighten all the way just yet. * Tighten the bolt for the return line * Tighten the Torx holddown bolt * Now reinstall fuel pump relay * Turn key on & wait a few seconds to allow pressure to build * Start car & look for fuel leaks under the FPR - Air/Fuel Ratio Tuning - (External Gauge) * Before tuning fuel pressure, you will need a Torx screwdriver * Both MSD & Edelbrock Rich/Lean Indicators come with O/2 sensor * Install O/2 sensor in exhaust manifold or header * Connect O/2 Sensor to gauge & power and ground to battery * Place gauge somewhere safe from falling & where wires aren't exposed to the engine fans or pulleys. * Start vehicle & get back under the hood * Read your gauge; - Lean; Turn your FPR adj. screw clockwise To Increase fuel pressure - Rich; Turn Your FPR adj. screw counterclockWise To Decrease fuel pressure * Once at preferred setting (Stoich) slowing increase idle speed upward. * When you start leaning out, slowly increase fuel pressure until you reach (Stoich). * Contine the following 2 steps until you've reached redline. * Now your fuel setup is tuned all the way up to redline. * Remove gauge & re-install O/2 Sensor, not gauge sensor. *** A side note; The gauge may give you an incorrect reading the first second during a sharp change in idle or fuel pressure. Make adjustments slowly; both fuel & idle.