Stranded out of town
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Northstar Engines and System Technical Discussion Discussion, Stranded out of town in Cadillac Engine Technical Discussion; Hey there fellow cady lovers. I own a 98 concours 191000 on here. Currently out of town and went to ...
  1. #1
    fristim is offline Cadillac Owners Fanatic
    Automobile(s): 98 Concours 212,000 orginal motor,trans
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    Stranded out of town

    Hey there fellow cady lovers. I own a 98 concours 191000 on here. Currently out of town and went to accelerate into traffic and lost power. Pull the codes and I get P0231 - Fuel Pump Feedback Circuit Low Voltage. Switched the ac relay with the fuel pump relay same thing. Put a fuel pressure gauge on it and nothing. pull the fuse for the fuel pum and put a voltometer on it and I get no voltage. Now Im assuming that there must be a circuit break probably in the fuel pump itself which is why Im not getting any voltage at the fuse for the fuel pump. Anyone ever done a fuel pump change? If so what do I need to do? Thankfully there is about a 4 gallons of gas in the tank. Thanks for your help.

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  3. #2
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
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    Re: Stranded out of town

    I had the same thing happen to me on my 88 Eldorado when I was out of town like you but it happened right after I filled with gas and it was a nightmare getting the thing down full of gas.

    The newer Devilles had an access hole in the trunk. I think yours doesn't but you might want to double check.

    Basically you need to lower the gas tank and there are 2 straps that are holding it up. Those straps need to be removed and the hoses that are attached to the tank need to removed and it should drop right down.

    Good luck... To have this job done would cost close to $500.

  4. #3
    fristim is offline Cadillac Owners Fanatic
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    Re: Stranded out of town

    ok well i dropped the tank and did a continouity test on the pump, and I got have a complete circuit. Ran 12 volts and the pump ran, plugged it back into the harness and nothing, checked the harness and no voltage to the pump when I turn on the key, any suggestions?

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Stranded out of town

    Fuel pump relay.

  6. #5
    fristim is offline Cadillac Owners Fanatic
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    Re: Stranded out of town

    fuel pump relay was the first thing I tried, switched the ac relay with the fuel pump and got nothing.

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Stranded out of town

    Ah, so you did. Read it too fast I guess, sorry.

  8. #7
    fristim is offline Cadillac Owners Fanatic
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    Re: Stranded out of town

    Now is the ac relay and the fuel pump relay interchangable.

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Stranded out of town

    Not sure, but I would think so.

  10. #9
    deville555 is offline Cadillac Owners Member
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    Re: Stranded out of town

    Yes they are interchangeable.

  11. #10
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
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    Re: Stranded out of town

    If you're planning on keeping the car, you might just want to put in a new fuel pump while the tank is down. Mine went 220k miles before it failed.

  12. #11
    fubar569 is offline Cadillac Owners Fanatic
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    Re: Stranded out of town

    screw pissing with the original harness. youve isolated the issue. do what i did in my old car to get more consistent pump performance....run your own wiring.

    1 relay
    heavy gauge wire from battery to relay (fused)
    ignition controlled power source
    more heavy wire to FP +
    and ground wires

    this makes sure your pump always has the highest voltage possible. if your battery sees 13.5 thats what the pump gets...not 11.1 because of the dinky factory wiring...

    you'll be better off at the end of the day...assuming your car wont throw a fit about not seeing any power on the stock FP circuit

  13. #12
    fristim is offline Cadillac Owners Fanatic
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    Re: Stranded out of town (UPDATE)

    Well after I put 12 volts to the pump and it ran I plugged it back in and still nothing. So I checked the relay plug in on the fuse box for voltage and I get 12.2 volts for about 2 secs when I turn the key on. Checked the other side of the relay circuit and I get nothing. So I went ahead and pulled 12 volts from another fuse, ran a jumper wire to the fuel pump fuse and there we go, got the fuel pump running and the car fired right up. But now I a whole shit load of codes that follow. Any Ideas thanks.

    P0102 - Mass Air Flow (MAF) Sensor Circuit Low Frequency
    P0753 - 1-2 Shift Solenoid Circuit Electrical
    P0758 - 2-3 Shift Solenoid Circuit Electrical
    P1645 - Evaporative Emission (EVAP) Vent Solenoid Contorl Circuit
    P1860 - TCC PWM Solenoid Circuit Electrical
    Those are all current by the way.

  14. #13
    fubar569 is offline Cadillac Owners Fanatic
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    Re: Stranded out of town (UPDATE)

    Quote Originally Posted by fristim View Post
    Well after I put 12 volts to the pump and it ran I plugged it back in and still nothing. So I checked the relay plug in on the fuse box for voltage and I get 12.2 volts for about 2 secs when I turn the key on. Checked the other side of the relay circuit and I get nothing. So I went ahead and pulled 12 volts from another fuse, ran a jumper wire to the fuel pump fuse and there we go, got the fuel pump running and the car fired right up. But now I a whole shit load of codes that follow. Any Ideas thanks.

    P0102 - Mass Air Flow (MAF) Sensor Circuit Low Frequency
    P0753 - 1-2 Shift Solenoid Circuit Electrical
    P0758 - 2-3 Shift Solenoid Circuit Electrical
    P1645 - Evaporative Emission (EVAP) Vent Solenoid Contorl Circuit
    P1860 - TCC PWM Solenoid Circuit Electrical
    Those are all current by the way.

    3 of the 5 are transmission related...where did you pull that 12v from? maybe a reference circuit by accident?

    what happens if you 12v from the battery (or another place) instead of your source. do the codes disappear?

  15. #14
    fristim is offline Cadillac Owners Fanatic
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    Re: Stranded out of town

    pulled the 12 volts both from the battery and from various other sources still get the same codes though.

  16. #15
    fubar569 is offline Cadillac Owners Fanatic
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    Re: Stranded out of town

    if you clear them andtake a drive do they come back? how does the car seem to run? it seems really odd it would spring all those other codes after fixing your fueling issue

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