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

  1. #21
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    And you will find it’s not a high pressure pump. It’s a circulation pump.

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  3. #22
    NostraJackAss Jack@European_Parts's Avatar
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    And you will find it’s not a high pressure pump. It’s a circulation pump.

    Depends on what you define as a HPP and it certainly isn't 1 BAR, as aforementioned, you didn't even know it was a pump & it's 7.5 BAR before bypass and to me that anything over 5 PSI & since I go back to carburetors, this is considered pretty high PSI.
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  4. #23
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    And Vasco I think itís unlikely to be the tandem pump. Although it has a test port on it to couple a gauge to if you have to.
    Iíve never had to.
    As before if the problem is fuel starvation as you suspect. You should investigate the function of the electrical pumps first.

    Both pumps are powered I think from the same relay so they will run at the same time. So if you hear a pump humming when you activate them
    It does not prove both pumps run. You have got to check. A pump thatís not spinning will restrict the flow from the other one.

  5. #24
    NostraJackAss Jack@European_Parts's Avatar
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    And you will find it’s not a high pressure pump. It’s a circulation pump.
    You are extremely incorrect!

    I feel I need to touch on this again & because if people dont understand basics WTF good is the information?

    I would like to add that the PD fuel pump & driven by cam is not by definition a "circulation pump".

    Any pump, regardless of amount of PSI generated & when it is to be used by another source to be expelled, injected or converted such as a fuel injector helix etc. is by definition an HPP regardless of returned to tank.

    If the pump only circulated a fluid and returned it such as a water pump and without losing any fluid that is by definition a "circulation pump" whether open or closed systems too.

    You will note that if you read the aforementioned SSP or RTFB it will not refer to the PD cam driven fuel pump as a "circulation pump" however, when observing the chiller for fuel cooler as example & which uses coolant, does use a "circulation pump".

    You have as have others simply became too reliant on what you believe is a definition of HPP, this since what is in your face now and what isn't, you just dismiss others & dont understand how pump systems work or classified in general.

    This is clear!
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  6. #25
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    Hmm 1800 bar is extremely high, The high pressure side in direct petrol injection is I would consider very high. Normal working pressure for an electric fuel pump in a petrol or diesel vehicle though can be as high as 7.5 bar and that would normally considered the low pressure system. This tandem pump has a pressure relief valve that will come off it’s seat at 7.5 bar that does not mean the pump runs at that pressure. If you blocked the return pipe 7.5 bar max and no more. Mostly it will run about the same as the other low pressure pumps that are feeding it.

    But you are perfectly correct you could consider any pressure above atmospheric to be high pressure.

  7. #26
    NostraJackAss Jack@European_Parts's Avatar
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    And Vasco I think it’s unlikely to be the tandem pump. Although it has a test port on it to couple a gauge to if you have to.
    I’ve never had to.
    As before if the problem is fuel starvation as you suspect. You should investigate the function of the electrical pumps first.

    Both pumps are powered I think from the same relay so they will run at the same time. So if you hear a pump humming when you activate them
    It does not prove both pumps run. You have got to check. A pump that’s not spinning will restrict the flow from the other one.
    If reading the SSP you will see a great layout of how the system works and bypasses air.

    Bleeding the system and testing actual output with gauges and volume measuring devices are the proper advisement using RTFB.

    Verifying the engine will fire by aforementioned tests is also advised.
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  8. #27
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    I read the SSP years ago when I learned that pd engine did not need a high pressure pump.

  9. #28
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    Agreed but if the op has not got all the test equipment we have got he can still do some basic testing with little more than a screw driver and some
    Hose and a bucket. Hopefully a test light if required.

    Anyway it’s a nice day here today. I guess it’s probably high pressure I’m going to open a bud and sit in the garden as we’re stuck at home.
    Cheers

  10. #29
    NostraJackAss Jack@European_Parts's Avatar
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    I read the SSP years ago when I learned that pd engine did not need a high pressure pump.
    But you forgot the pump even existed?

    Look man, I'm just more concerned with people understanding basic operations versus splitting hairs on what you want to rename for actual function.

    The pump in tank or on head driven by cam is by definition an HPP & regardless of stage it is at, that includes the helix in the injector pump itself.
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  11. #30
    Verified VCDS User Vasco Ferraz's Avatar
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    Thank you all

    What I did was:

    1 - Disconnected the diesel hose that supplies fuel to the tandem pump.

    2 - I used VCDS to purge and lots of fuel comes out.

    3 - Now what?

    4 - Disconnected the intact manifold and injected with starter fluid <-- Thanks Jack.

    5 - I cranked and I was able to ear some explosions.

    6 - "Good, good. Let the explosions flow through you".

    7 - Injected more starter fluid.

    8 - Cranked again and it is working like a Swiss clock.

    9 - After like 15 minutes at idle I checked the fuel filter cup to make sure it was being filled by the pump at the tank. And it was full. So that fuel pump in the tank is working fine.

    So, what makes sense is that I really ran out of fuel and had an air lock in the system.

    The big issue is that I have to replace the fuel pump at the tank because it's there where the fuel sender sensor is.
    Vasco Ferraz

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