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Old 12-27-06, 01:49 AM
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SkarTisu SkarTisu is offline
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Join Date: Dec 2003
Location: Minnesota
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Re: How to check for a faulty FPR (Fuel Pressure Regulator) and replace it

Finally got mine swapped out. Here are some tricks I learned along the way.

- FPR location on the 4.9s is between the distributor and the throttle body. You have to remove the airbox to see it
- Remove the distributor cap AND rotor to get an unobstructed shot at the FPR fixing screw. I found it easier to mark all the plug wires, remove those, as well as the white connector on the distributor cap so I could fully move it out of the way
- The correct Torx key size for the fixing screw is a T27
- Using a Torx L-key, not a Torx bit, was the winning combination. I couldn't get a Torx bit secure on the screw to turn it
- Don't forget to fish the o-ring out of the old FPR and transfer it to the new one. Starting the car without that o-ring was a BIG (but not flaming) surprise!
- Even though you released fuel system pressure before disconnecting the old FPR (RIGHT?!) you'll still get fuel spillage out of the rail when you remove the FPR. Put that cigarette out first! Also, put something underneath the FPR to catch the fuel that will spill out. I'd guess that a tablespoon of fuel leaked out on mine.

I'm very pleased with the results. I haven't had a chance to test a "heat soaked" start yet, which was a problem before, but driveability especially at very light throttle application is much better. She pulls away from a stop smoothly now instead of a slight lurch and stumble. Fuel mileage appears to be improved, but I'll need to drive a whole tank to be sure. I think I got some power back (I should have anyway) but it's not a night-and-day difference. She jumps when you put the coals to her, though!