The Field Service Manual does not detail the basic steps for replacing the Fuel Pressure Regulator .

fuel pump relay

 Below are instructions for replacing it.

  1. Remove the plastic cover from the intake manifold.
  2. Remove the vacuum pipe that runs between the Regulator and the intake manifold. (Intake manifold side first.)
  3. Unplug the two connectors on the throttle body (MAF and TPS) so the wiring harness can be moved out of the way.
  4. 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.)
  5. 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!

  6. 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.
  7. 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.)
  8. 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.)
  9. 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.
  10. Reassemble the vacuum hose, breather hose, and electrical connections.
  11. Turn key without starting the engine in order to activate the fuel pump.

    Check all connections carefully for leaks!

  12. Start engine. It may take a few tries to get running. Try to keep it running for a minute or so.
  13. Turn ignition off, check for leaks, then restart. Hopefully, the computer will set it to fast idle and start relearning this time.
  14. Check for leaks again. Go for a short test drive.

    Safety first! Make a final check of all connections for leaks.

  15. Replace plastic cover on the intake manifold.

Thanks to wws944, member of the AACA Reatta forum, for this information.

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