Defender Td5 Fuel pump not priming





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  1. #1
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    Default Td5 Fuel pump not priming

    I know there are many posts about TD5 fuel priming and weird noises but I can't find the solution.

    With the key in position two, the fuel pump whines for 3minutes before it turns off... is this a normal length of time? I did this a few times.

    Also, when I press the pedal 5 times after, it doesn't go into it's bleeding stage... any reason for this?

    I suspect there is air in the system, I can almost hear it near the fuel pump but no matter what I do I can't seem to bleed the damn thing.

    I have attached the sound it makes by the driver side wheel arch, it makes this sounds throughout
    Attached Files Attached Files

  2. #2
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    Default Re: Td5 Fuel pump not priming

    Hi Saffaoverland. That does not sound like it is building up pressure in the lines. If it was it would go quiet fast or die down and timeout.
    You dont state if you get the engine started or not?

    I think one of the lines on the pump unit might be off or broken. It sounds like the pump is picking up but pumping it back into the tank.
    Take the low presure feed off at the filter to see if the pump is picking up the fuel.

    If so push the pedal down and keep cranking to see if it gets fuel in the highpresure lines enough to start it.

    If not you should get the pump out and inspect.

    Not doing the prime sequence after 5 pedals, not sure about that?
    Last edited by Wildkyker; 2019/09/05 at 07:56 PM.
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  4. #3
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    Default Re: Td5 Fuel pump not priming

    I've had a noisy fuel pump on my Disco 2 Td5. It also sounded like it needed priming to get air out of the system. About 2 months after it started complaining the pump failed. The motor started and ran but didn't rev and had no power. I borrowed a pump assembly from a friend and tested the system with it fitted. All worked well so I got a new pump from VDO and build it into the housing and put it back in the Disco. Still operating perfectly 2 years down the line. My advice is to get a new pump and fit it before the other one fails and leave you needing recovery from the middle of nowhere.
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  6. #4
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    Default Re: Td5 Fuel pump not priming

    1. a kind of hissing sound from the FPR area is normal while the pump is running, it's not air but the sound of fuel passing through the diaphragm
    2. the ECU times out the pump if it doesnt get crank signal input within 3 minutes since the ignition was turned on so after that the 5 pedal trick is useless unless the ignition is recycled
    3. better describe what's your problem cos IMO it's not about air in the system, why do you say you can't purge it cos as long as it ran 3 minutes even if it was air in the system it should have been purged out.... did you replace the air bleed valve(WJN500110) in the filter head ?
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  8. #5
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    Default Re: Td5 Fuel pump not priming

    Quote Originally Posted by Wildkyker View Post
    Hi Saffaoverland.
    You dont state if you get the engine started or not?
    It's starting perfectly fine once the glow plugs are warm, but to be honest it does feel a little sluggish compared to other td5's I've driven, but I wasn't sure if those TD5s were remapped. It cruised at 120kmh today which made me think it was all fine haha.

    Quote Originally Posted by Paul#25 View Post
    The motor started and ran but didn't rev and had no power. My advice is to get a new pump and fit it before the other one fails and leave you needing recovery from the middle of nowhere.
    This could explain the slight lack of power. I will price out a pump this weekend.

    Quote Originally Posted by sierrafery View Post
    1. a kind of hissing sound from the FPR area is normal while the pump is running, it's not air but the sound of fuel passing through the diaphragm
    2. the ECU times out the pump if it doesnt get crank signal input within 3 minutes since the ignition was turned on so after that the 5 pedal trick is useless unless the ignition is recycled
    3. better describe what's your problem cos IMO it's not about air in the system, why do you say you can't purge it cos as long as it ran 3 minutes even if it was air in the system it should have been purged out.... did you replace the air bleed valve(WJN500110) in the filter head ?
    1. Oh okay that is alright then.
    2. I did the 5 pedal trick on other ignition cycles and it wouldn't do the bleed/prime cycle that I am used to, just carried on for 3 minutes and stopped... But like Paul#25 said it should be 10seconds or so, not 3 minutes.
    3. I am replacing the filter on Saturday (doing a 40k service on it), and will look at replacing the copper injector washes as apparently this can also cause the symptoms I am experiencing, don't know what your thoughts are on that? After checking all the fuel lines, replacing the filter and injector washers, I will then look at installing a new pump.

    Thanks for your help

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    Default Re: Td5 Fuel pump not priming

    Before you start replacing injector washers etc. Rather get the fuel pressure tested. You insert a Guage into the hole that the fuel temp sensor screws into on the fuel pressure regulator. It's relativly quick to do. You need 4.2 bar.

    This is much easier to do and at least puts the fuel pump failure issue to rest.

    If that's good then also remove the tappit cover and see if there's fuel pooling in the head near no 1 injector, if not the head is good and not cracked.

    If that's good then injector washers and as suggested the non return valve in the oil filter assembly.

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  11. #7
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    Default Re: Td5 Fuel pump not priming

    ... some of problems Ive heard cause squealing etc incl in order:
    * Fungus stuff , dirt etc in fuel tank
    impeding intake ...
    * fuel filter needs change
    * cracked/blocked fuel lines ...
    * fuel regulator
    * tired pump motor

    I had v. unusual case where an injector was faulty and ECU evidently kept switching fuel pump on and off
    ... fatigued/killed 3 pumps, changed injector ... all fine since ...

    if I have problem again ... first thing will be to measure P as NewLandy above says ...
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  12. #8
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    Default Re: Td5 Fuel pump not priming

    Quote Originally Posted by saffaoverland View Post
    2. I did the 5 pedal trick on other ignition cycles and it wouldn't do the bleed/prime cycle that I am used to, just carried on for 3 minutes and stopped... But like Paul#25 said it should be 10seconds or so, not 3 minutes.
    From WSM- Fuel delivery system Td5
    DESCRIPTION AND OPERATION 19-1-13

    When the ignition switch is moved to position II, the fuel pump relay in the engine compartment fusebox is energised
    by the ECM. Battery voltage is supplied from the fuel pump relay to the fuel pump which operates. If engine cranking
    is not detected by the ECM within a three minute period, the ECM will ’time-out’, de-energising the fuel pump relay.
    When the ignition is turned off the ECM timer will reset.
    Last edited by sierrafery; 2019/09/05 at 09:51 PM.
    2000 Discovery Td5 ES manual, tuned

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  13. #9
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    Default Re: Td5 Fuel pump not priming

    Bleed procedure.
    Key to second position. Then immediately:
    Press Accel pedal to floor 5 times before check engine light goes out.
    Pump will go into prime mode.

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