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Thread: Low pressure fuel pump not working

  1. #1
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    Vehicle : Vectra

    Trim : SRI

    Engine : 3.0 cdti

    Year : 54

    Default Low pressure fuel pump not working

    Good afternoon all,

    just got the engine assembly back on after changing the egr pipe work and cleaning map sensor but the car won't start..

    if I crank it the car turns over and fires once every two to three seconds. It looks and sounds like the fuel pump relay or pump is not energises. I've check the relay off the car and it work.

    any idea why pump/relay is not working?

    is there anywhere to get a wiring diagram for a vectra c 3.0 cdti y30dt? Can't find anything on the net.

    cheers

    ben.

  2. #2
    Regular Member Critch's Avatar
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    Vehicle : vauxhall vivaro

    Trim : Basic

    Engine : 1.9

    Year : 2004

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    They have no low pressure high pressure is auction pump

    Suggest undoin fuel filter bolt and filling to brim.
    and retrying

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    Quote Originally Posted by Critch View Post
    They have no low pressure high pressure is auction pump

    Suggest undoin fuel filter bolt and filling to brim.
    and retrying
    That's why I can't here anything.... Lol

  4. #4
    Regular Member Critch's Avatar
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    Vehicle : vauxhall vivaro

    Trim : Basic

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    Year : 2004

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    Quote Originally Posted by Bendy21 View Post
    That's why I can't here anything.... Lol
    Weve all been their I couldn't get mine started for love nor money after I did head gasket, had to mainuallybpoor fuel into pump

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    Trim : SRI

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    Year : 54

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    Tried topping up fuel filter but it looked full anyway. Then decided to change fuel filter, topped up again and tried. Same thing, with it cranking and only getting the odd fire.

    i don't think fuel is the problem as I hadn't touched the circuit. All that was removed was the battery box, top inlet manifold section to get access to MAP sensor and remove exhaust shields around EGR pipe. Ecu or injector module wasn't removed and I replaced the 4-5 sensors plug I removed during strip down.

    When you turn the ignition on and the normal lights come on. When cranking, the engine light remains lit, which I think is normal and there are no error messages coming up. Checked for codes and none present?

    first diesel I have owned and as there appears to be no circuit diagrams about for a Y30DT I'm struggling how to diagnose the fault. (No spark to check for). Gonna try cold start spray tomorrow down the inlet to see if it actual runs and maybe bleed the fuel line through.

    had the car two weeks now and only driven for one. Trust me to buy a smoker......

  6. #6
    Regular Member Critch's Avatar
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    Year : 2004

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    What are you reading codes with?

    Go back an recheck all the sensor plugs
    All intake and related parts are fited correctly?

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by Bendy21 View Post
    When cranking, the engine light remains lit, which I think is normal and there are no error messages coming up
    Three engine warning lights remain on, until the engine turns over twice, after which only the handbrake warning light should be on
    Therefore can you confirm which engine warning light is staying on?

    If you have disconnected the fuel pump, then treat it the same as renewing the fuel filter
    Turn the engine over for a maximum of 10 seconds, then wait 10 seconds
    Repeat if required
    Repeat if required
    The engine should now start, but may idle erractically and/or stop, this is normal
    Once it is idling as normal, leave for at least 5 minutes, then switch off
    Again, it may switch off, but it shouldn't do it more than twice
    It should then start normally

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    Quote Originally Posted by m8internet View Post
    Three engine warning lights remain on, until the engine turns over twice, after which only the handbrake warning light should be on
    Therefore can you confirm which engine warning light is staying on?

    If you have disconnected the fuel pump, then treat it the same as renewing the fuel filter
    Turn the engine over for a maximum of 10 seconds, then wait 10 seconds
    Repeat if required
    Repeat if required
    The engine should now start, but may idle erractically and/or stop, this is normal
    Once it is idling as normal, leave for at least 5 minutes, then switch off
    Again, it may switch off, but it shouldn't do it more than twice
    It should then start normally
    YOU ARE A GOD !!!!

    followed the starting procedure above and on the 4th attempt she fired into life...

    why did the car not start with long bouts of continuous cranking?

    its bellowing out loads of dark grey smoke when rev'd a bit but I'm not surprised with all the cranking I've done yesterday.

    thank you everyone involved in this post with your help and recommendations. Good to know there is a specific forum of owners happy to help/advise

    hopefully I won't be on again for a while and can have some problem free driving.

    Ben...

  9. #9
    Regular Member m8internet's Avatar
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    Quote Originally Posted by Bendy21 View Post
    why did the car not start with long bouts of continuous cranking?
    It is a low pressure inlet
    This draws fuel from the fuel tank very slowly
    When the fuel system is de-pressurised (such as removing the fuel filter housing cap) the system needs to be re-pressurised
    You could leave the engine to crank over continuously but you could overheat the starter motor, and so create other issues
    Therefore the advice is to complete the re-pressurisation in several short bursts

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    Trim : Elite

    Engine : 1.9

    Year : 07

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    Quote Originally Posted by Critch View Post
    They have no low pressure
    Yes I know this is years old before anybody says but I've got one in mine (08 3.0 cdti) under the back seat..20211122_163740.jpg

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