Need advice after changing FPR on 1994 Eldo
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Need advice after changing FPR on 1994 Eldo in Past Cadillac Vehicle Discussion; Hello all. I hope this is posted in the right section. I have been a member for sometime now and ...
  1. #1
    jpap's Avatar
    jpap is offline Cadillac Owners Member
    Automobile(s): 1994 Eldo, 1989 Deville
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    Exclamation Need advice after changing FPR on 1994 Eldo

    Hello all. I hope this is posted in the right section. I have been a member for sometime now and benefited greatly from all the knowlege on this board. Whenever I ran into a problem with my car, I was always able to search this site and find solutions and tips on how to fix something. I am by no means a mechanic in the true sense of the word but have always been able to repair things that go wrong and the help on this board made it that much easier.

    I am having a problem with my 1994 Eldorado TC and hope someone can offer some help. It currently has 100k and has been a relatively trouble free car since I bought it new. After experiencing rough idling, sputtering and hesitation and no sign of any codes(old or new)I found the time to change the FPR. I narrowed it down to the FPR only because I already performed a tune up (wires, coil packs and plugs)and changed the EGR valve.

    Well it runs worse now that it did before. It barely starts and when it does it does it shakes, rattles and rolls with a lot of smoke but no codes. I disassemble everthing again and noticed a lot of fuel in the bottom of the manifold? Is this normal? I will have to assume it is not and maybe the reason it runs so badly. I was not able to remove the fuel rail? completely because of a wiring harness that goes through the rail but I was able to lift the rail enough on one side so I can replace the FPR.

    The new FPR came with two O rings. One is metal, the other is rubber. I compared both the old FPR and new FPR, side by side and was unable to determine where these rings should go. They do not fit anything on the FPR from what I can tell. Do they belong somewhere in the holes where it plugs into? Any help you guys can provide would be greatly appreciated. Thanks.

    John

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Need advice after changing FPR on 1994 Eldo

    No, fuel in the bottom of the manifold is not normal. It is probably from a leaking FPR. You can check it by turning the ignition on, but DO NOT crank as the engine will runaway unthrottled as in WOT. When the ignition is turned on, the fuel pump is energized and the fuel system is pressurized. There is an "O" ring that goes down in the rail to keep the FPR from leaking "where it plugs into". Did you get the old one out or is it still stuck in there? The leak should be apparent if you do the test. Sounds like yours is leaking badly.

  4. #3
    jpap's Avatar
    jpap is offline Cadillac Owners Member
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    Thread Starter

    Re: Need advice after changing FPR on 1994 Eldo

    Ranger,

    Somehow I knew you would be the one to offer advise and assistance. Thank you. I will dissasemble everything again and start all over. I will, if anybody is interested post any results.

    Thanks again,

    John

  5. #4
    ewill3rd is offline Cadillac Technician
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    Re: Need advice after changing FPR on 1994 Eldo

    You should assemble the regulator as follows:

    Spacer ring, Large O-ring, filter screen then there is a little tiny o-ring.
    It sounds to me like you don't have the little O-ring in place.
    It's easy to miss and easy to drop.
    If the little O ring is not in place fuel pressure will bleed right back to the tank and the car will barely run. Make sure to get the old tiny O-ring out of the rail and assemble all the components on the new fuel rail, put a little dab of engine oil on the o-rings and it will slide right into place.

  6. #5
    jpap's Avatar
    jpap is offline Cadillac Owners Member
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    Re: Need advice after changing FPR on 1994 Eldo

    Followed the advise given and I am happy to say my Eldo is running perfectly.

    Thanks to all.

  7. #6
    Ranger's Avatar
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    Re: Need advice after changing FPR on 1994 Eldo

    Anytime you do a job and the outcome is worse than before you touched it, you can rest assured you screwed something up. Been there, done that. Retracing your steps usually will reveal what you did wrong. I also find that watching closely how things come apart is worth its weight in manuals. Nice to have someone like ewill3rd around with detailed instructions.

  8. #7
    jpap's Avatar
    jpap is offline Cadillac Owners Member
    Automobile(s): 1994 Eldo, 1989 Deville
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    Re: Need advice after changing FPR on 1994 Eldo

    Ranger, I have to admit I really thought I screwed up big time. I finally realized a Factory Service Manual may be a good investment.

    ewill3rd, thanks for going out of your way to help.

  9. #8
    Ranger's Avatar
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    Re: Need advice after changing FPR on 1994 Eldo

    Quote Originally Posted by jpap
    Ranger, I have to admit I really thought I screwed up big time. I finally realized a Factory Service Manual may be a good investment.

    ewill3rd, thanks for going out of your way to help.
    Best investment you'll ever make if you are going to do your own diagnosis & maintanence.

  10. #9
    ewill3rd is offline Cadillac Technician
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    Re: Need advice after changing FPR on 1994 Eldo

    No substitute for a factory manual for your car.
    Not sure if they give detailed info on the o-rings for the FPR though...

    Guess how I knew that was the problem

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