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Thread: Golf mk5 2008 diesel cranks but won't start

  1. #11
    NostraJackAss Jack@European_Parts's Avatar
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    Jack,

    Are you sure that this can't be a fuel air lock?

    I am not 100% sure but I always do a trip reset at each fuel filling (always full filling).

    At 100/110km/h, I do 1100km per deposit when the low fuel warning pops (average of 4.3L/100km).

    This latest 3000km I changed my driving style and the average consumption is 5.7L/100km.

    The trip shows 930km and I am 99.99% sure that I did a trip reset.

    Another fact is that the fuel filter reservoir was empty.

    Also, I can hear the fuel pump working when turning the key or performing the VCDS fuel priming procedure.


    How would I know, respectfully I'm not there.......

    Gauges and measuring devices it is time is it not, verify prime or manually bled with mighty vac?

    Why did it loose prime and did you check for leaks or on suction side if sucking air?

    Isolate zones with mighty vac and crimps yet?

    Did you know that you can grind a vise grip smooth & so it doesn't damage hoses when crimping or insert a adapter jaw plates


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  2. #12
    Verified VCDS User Vasco Ferraz's Avatar
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    Jack,

    Thank you so much for your help

    What I was trying to say is that I believe that I ran out of fuel... drying all the lines.

    I don't have such tools :|

    My idea is to:

    1) Add more 6 litres to the tank.
    2) Unplug the intake fuel hose that connects to fuel filter housing to check if, when cranking, there is diesel being primed from the fuel tank.
    3) If the above does not happen it means that there is air between the tank and the filter filter housing
    4) So, I will remove the back seat to reach the fuel sender and fill the it with diesel.
    5) Repeat number 2.

    Does this makes sense?
    Vasco Ferraz

  3. #13
    NostraJackAss Jack@European_Parts's Avatar
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    Come on buy a mighty vac is advised or use any vacuum to suck fuel up to HPP.

    You could always use compressed air and siphon feature or vaccula too, or ever hear of taking tire air pump and reverse the polarity or make a suction line through a soda bottle?

    https://www.instructables.com/id/con...ressor-into-a/

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  4. #14
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    So can I say that a golf with a PD engine has no high pressure fuel pump, the unit injectors are there own high pressure pumps. It will probably have 2 x low pressure pumps. One in the tank and one at the timing belt end of the rocker cover beside the fuel filter. If you run out of fuel it should self prime. If you have found the filter was empty then a pump or both pumps are not pumping or there’s a blockage in the line or filter. There is a feed and return pipe from the tank to the filter and a feed and return From the filter to the injectors inside the rocker cover. The filter top should have arrows to show which is which. First listen to both and make sure you can hear them running then if they are I would find the one that comes out of the filter to the cylinder head and using a extra bit of hose pointed in to a bucket find out if you have fuel flowing through the system. Or plumb in a piece of clear hose. Be very careful of potentially spilling fuel.

    A pump can sound like it’s pumping but not actually pump. And if the tank pump works but the under hood pump doesn’t it can actually block the flow. Also of course the pumps need to start pumping when the engine starts to crank over not just when asked to with the scan tool or during priming.

    If it had run out of fuel adding 6 Lts would be enough to get it running again.

    All that is provided it’s a PD engine and not Common rail. And since you’ve said there are no fault codes.

    Also as jack said you could spray some flammable spray like brake/carburettor cleaner (not easy start) into the air intake and provided there is good compression and no inlet or exhaust blockages it should start and run for as long as you keep adding a little fuel. If it runs from an external fuel supply like that it should be able to run with its own fuel supply. This can get a vehicle that has an air lock move the air bubble and then run on its own, older rotary high pressure pumps were bad for this.
    However it’s possible to do some serious damage doing this and it should only be done with great care by some one who knows what there doing.


    HTH

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  6. #15
    NostraJackAss Jack@European_Parts's Avatar
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    The PD indeed has a rotary HPP built in with combination of the vacuum pump on the cylinder head and driven by camshaft.

    There can be a lift pump in tank, boost pump, than HPP and than each unit injector incorporates a high pressure helix within the injector and is limited by camshaft rocker stroke with lash, additional the delivery method of fuel to helix pool & is controlled by a solenoid on each.

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  7. #16
    Verified VCDS User Vasco Ferraz's Avatar
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    Hi Pinpointdiag,

    Hi Jack,

    I believe that Pinpointdiag is right, that is, PD engines does not have any high pressure fuel pump.

    The high pressure is done at each unit injector (something around 1900 bar).

    This PD engine has one lifter pump in the tank and (I believe!) another low pressure pump in the engine bay, like Jack said, connected to camshaft.

    I believe this pump shares functionality with the servo brake enhancer -> I am talking about the tandem pump.

    So, after all this discussion I am pointing for a faulty tandem pump :| But this is just a guess ^^!
    Vasco Ferraz

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  9. #17
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    Sorry, Jack is correct I was forgetting about the camshaft driven tandem pump. Not sure it produces high pressure though? 1bar at idle is it not.

    Have a good look for the Electrical transfer pump. I think it will have one. It’s not obvious at first but if I remember correctly it’s in front of the filter on the right hand inner wing.

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  11. #18
    NostraJackAss Jack@European_Parts's Avatar
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    Sorry, Jack is correct I was forgetting about the camshaft driven tandem pump. Not sure it produces high pressure though? 1bar at idle is it not.

    Have a good look for the Electrical transfer pump. I think it will have one. It’s not obvious at first but if I remember correctly it’s in front of the filter on the right hand inner wing.
    Should you not go back to school & RTFB, further sharpen your pencil, the 1 BAR you aforementioned is a requirement on return line for proper chiller function & because if fuel isn't circulated quickly out of head by HPP, the fuel will become too hot just between injectors due to helix and latent cylinder head temperature on feed from zyl 4 to 1?
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  12. #19
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    So what is the maximum pressure of the tandem pump then.

  13. #20
    NostraJackAss Jack@European_Parts's Avatar
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    So what is the maximum pressure of the tandem pump then.
    RTFB and hook up a gauge.
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