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Thread: P1191 - Fuel Pump or Regulator?

  1. #1
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    Default P1191 - Fuel Pump or Regulator?

    Hello!

    It just happend to me today and I am bit scared seeing all the problems with the HP pumps and regulators to the Z22YH engine.

    The car and spanner appeard on the dashboard. The car was still driving fine. I stopped the car and the spanner dissapeard for 5 minutes. Then I stopped again and I couldn't start the car. After a few minutes the car started.
    I checked the codes with OP-COM and:
    P1191 - Fuel Pressure System Malfunction
    (52) - Present

    After that I checked the Fuel Pressure feedback. With warm engine was between 700kPa and 5000kPa without doing anything . With a cold engine the fuel pressure was almost stable.

    So....how can I find out if it is the pump..the sensor...or the regulator.

    Thank you very much!!

  2. #2
    Regular Member kenp's Avatar
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    Vehicle : Vectra C


    Engine : 2.2 Direct

    Year : 2004


  3. #3
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    I've read the thread. So after you changed only the regulator and the sensor the car was ok for about 8-9 months? Because I would go for the cheaper option to change only regulator and sensor.
    I've read somewhere else that the HP oumo is damaged if the pressure is under 600kPa wich is not my case.

  4. #4
    Regular Member kenp's Avatar
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    Vehicle : Vectra C


    Engine : 2.2 Direct

    Year : 2004

    Default

    Yes thats correct.

  5. #5
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    Default

    Thank you kenp!
    I will search for fuel sensor and regulator. Do I need to change them both? Any recommendations?

  6. #6
    Regular Member kenp's Avatar
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    Vehicle : Vectra C


    Engine : 2.2 Direct

    Year : 2004

    Default

    Dont know that you need to change them both.. i did, as i wasnt sure witch one was faulty...

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    any recommendation for buying the regulator? because I read on the forum that there are some problems with certain ones...

  8. #8
    Regular Member kenp's Avatar
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    Vehicle : Vectra C


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    Default

    i would go for the dealer one on that.. as there was introduced a new and revised one.

  9. #9
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    thanks! i'll do that!

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    Have you tried replacing the fuel filter ?

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