The Field Service Manual does not detail the basic steps for replacing the Fuel Pressure Regulator .
Below are instructions for replacing it.
- Remove the plastic cover from the intake manifold.
- Remove the vacuum pipe that runs between the Regulator and the intake manifold. (Intake manifold side first.)
- Unplug the two connectors on the throttle body (MAF and TPS) so the wiring harness can be moved out of the way.
- Remove the breather hose that runs between the valve cover and the throttle body (throttle body side first - by squeezing the clip and sliding it backwards. The valve cover side pulls out of the rubber grommet.)
- Unscrew the fuel return line at the Regulator with a 16mm flare nut wrench (the kind that is almost a box, but has a slot cut in one side for the tubing to slip through). Fuel will siphon back to the tank.
Place a rag under the Regulator to catch the screws that are sure to drop, before performing the next step!
- Use a 10mm 1/4" drive socket with 1/4" ratchet. A 3/8" drive socket and ratchet will not fit when attempting to unscrew the bottom screw.
- Place more rags to catch the fuel when you yank the Regulator off. (BTW, it might help to relieve the pressure via the schrader valve prior to doing this.)
- Apply a bit of oil to the O-ring on the Regulator. Insert it by gently rocking, not twisting, it in. Tighten the two 10 mm screws "tight enough". (No torque spec.)
- Probably a good idea to replace the tiny O-ring at the end of the return line. Then tighten it with the 16mm flare nut wrench.
- Reassemble the vacuum hose, breather hose, and electrical connections.
- Turn key without starting the engine in order to activate the fuel pump.
Check all connections carefully for leaks!
- Start engine. It may take a few tries to get running. Try to keep it running for a minute or so.
- Turn ignition off, check for leaks, then restart. Hopefully, the computer will set it to fast idle and start relearning this time.
- Check for leaks again. Go for a short test drive.
Safety first! Make a final check of all connections for leaks.
- Replace plastic cover on the intake manifold.