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Thread: P38 Does not want to start

  1. #1
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    Exclamation P38 Does not want to start

    Hi mates,

    I have a big problem with my p38 2.5 DSE. Last night I was driving it and the fuel was very low, so when I arrived at home my P38 stopped because there was no fuel on it.

    So today, I went to the petrol station bought some diesel. Then when I came back at home I filled the tank and tried to start it again. But it did not want to start, I thought it was not a problem because the fuel filter need to have some fuel in it but I was trying to start it for 15 minutes that I thought it will be better to stop because I don't want to burn the starting motor.

    What shall I do?

    Thanks

  2. #2
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    You might need to bleed the injectors before it will run if you ran dry.

    Get someone to turn the engine over whilst you crack the nut on the back of the injectors, do them one at a time and wear eye protection as diesel will spurt out when the line is full, I would suggest you start nearest the fire wall because the engine will try to run on 3 cylinders before you are finished, you will still need to bleed the rest of the injector just be careful not to get caught by any moving parts doing the last couple.

    Once it's running rough you can stop cranking, obviously.

    If you ran completely dry now might be a good time to change your fuel filter as well, just in case you have picked up some muck from the bottom of the tank.


    Should take less than 5 mins to be running again, good luck





  3. #3
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    Quote Originally Posted by finallyrangie View Post

    You might need to bleed the injectors before it will run if you ran dry.

    Get someone to turn the engine over whilst you crack the nut on the back of the injectors, do them one at a time and wear eye protection as diesel will spurt out when the line is full, I would suggest you start nearest the fire wall because the engine will try to run on 3 cylinders before you are finished, you will still need to bleed the rest of the injector just be careful not to get caught by any moving parts doing the last couple.

    Once it's running rough you can stop cranking, obviously.

    If you ran completely dry now might be a good time to change your fuel filter as well, just in case you have picked up some muck from the bottom of the tank.


    Should take less than 5 mins to be running again, good luck




    Thanks for answer. Before bleeding the injectors, I noticed that the tank fuel pump does not work, because it does not pass diesel through the fuel filter.

    Where can I locate the tank fuel pump?

    Thanks

  4. #4
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    start

    The fuel pump will probably not pump until you crank the engine over.
    Not sure with the diesel but that's how the petrol ones are.

    John

  5. #5
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    The lift pump usually only gets the fuel to the filter, if the fuel filter is full it should be working. technically the engine should start with just the injector pump working, it won't run well but it should start.

    I have a different diesel engine in mine so I'm afraid I don't know the specifics of the BMW engine, if it's a mechanical lift pump it will only work with the engine turning over.

    If it's like mine there is no pump in the tank, I have a cam driven mechanical lift pump which fills up the fuel filter, then the injector pump takes over to put the fuel into the engine. Try tracing the fuel pipe back from the filter and see if it goes back to anything on the engine, they are usually pretty reliable.




  6. #6
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    Just did a quick ebay check, looks like you have an electric, in tank fuel pump, so I'm afraid it depends if you have an access panel in the boot floor as to how easy it will be to get to, try getting it going first would be my suggestion, the pump might just be struggling if there's no fuel flow





  7. #7
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    Quote Originally Posted by Dantosky View Post
    I went to the petrol station bought some diesel.
    i see the problem

  8. #8
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    The low pressure pump in the tank runs all the time with the ignition on. Priming the fuel system is simply a matter of disconnecting the fuel filter outlet pipe & turning the ignition on until the fuel runs out of the filter.

    If your in tank pump isn't working, you'll probably find it's likely the injector pump had enough 'suck' to compensate until the system was opened (replace filter or run out of fuel).

    Unfortunately, accessing the low pressure pump means dropping the tank. The pump location might differ from the petrol cars but you can search this section for advice on where to cut the floor for easier access in the future. It will be roughly in the same spot but the measurements provided might be out in your case.

    Did you buy the blue one on eBay recently?
    Scott

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