Adjustable Fuel Pressure Regulator

There are two trains of thought on the installation of this mod. One is to take the rails off the car. Then there's mine "LEAVE THEM ON". So this install is going to be be with the rails on.

This mod must be performed in a well ventilated area (because fuel WILL come out of the rails and the old regularter) on a cold engine.

The first step in the install is to put on the fuel pressure test gauge and take a reading. It should be somewhere around 48psi. The port for the gauge is located on the rear passenger side of the fuel rail behind the manifold.

You must check the pressure with the vacuum line disconnected. It's the thin black plastic tube that runs to the top of the FPR. With the engine shut off, screw on the female Schraeder valve coupling from the Fuel Pressure Test Gauge. Make sure you have some rags or something underneath the fuel rail to absob any excess fuel while installing the gauge. Make sure all the fittings are tight.

Do not turn the ignition switch on until the gauge has been installed. Once again make sure all the fittings are tight. Turn on the ignition (not the engine) for 20 seconds and then turn it off. At this point, check for leaks.

If you don't have any leaks, start the engine and check your gauge.

Now for the AFPR. As you can see from the pic above the FPR is located on the back, drivers side of the intake. You really cant see it, but you can see the bracket. To remove the TORX fastener that holds the regulator to the fuel rail, you'll need a T-27 bit and a ratchet. I got about two turns with the T-27 and had to go to a T-30.

The next step is to remove the bracket that holds the two fuel lines together. You will see the bracket but not the TORX fastener on the bottom. For this one I had to make my own tool (you can't get a ratchet under the braket to turn it). I took a small 1/4 closed end wrench and taped a T-25 bit in it. This allowed me to be able to turn the TORX screw and not worry about the bit falling out.

Now you can pull the fuel return pipe out and away from the motor to work with it. Remove the clip that holds the fuel pipe to the bottom of the regulator and pop it off. There will be some fuel coming out of the old regulator, so be careful.

In the pic above you can see the tool I used to get the bracket off the fuel pipes, the clip that held the pipe on, and the two regulator.

Now it's time to put the AFPR in! With the fuel pipe out it's pretty easy to put the AFPR back on. Put the pipe back in the bottom of the AFPR and put on the clip. As shown in the picture. Then just reverse the steps you did to take the old regulator out. And check the pressure again. Once you have the pressure where you want it, you might have to tighten the bolt on top of the AFPR so it doesn't feel loose. Put the vacuum line on the new AFPR and your ready to go. I have mine set to about 39psi, but it's gonna be up to you where you set yours.

The Formula was stumbling a little and even stalling at times in the mornings during cold start ups. So I riased the setting from 39 to 42psi's. Seems to be running alot better now as well.

Once again be sure to check the CMA statement on the bottom of the mods page.

Thanks again to all the guys at V8 F-Body On Line for this FREE mod!!!!