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Thread: HPFP Constructive, considered opinions & advice welcome

  1. #1
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    HPFP Constructive, considered opinions & advice welcome

    Hello again knowledgeable people, not exactly seeking a silver bullet however I feel sure there are some quite worthwhile and constructive opinions & advice out there.

    I have a 2006 2.7 litre Disco 3 , 242,000 kilometres. It has been diagnosed as having a faulty High Pressure Fuel Pump, all the info I've read (I'll get in first, I haven't read all that's out there) seem to confirm this. The very experienced mechanic has spent over a week trying to make sure his diagnosis is correct before diving in the expensive end. I'm getting the car back next week & will do further investigation myself.

    Question one, considering the kilometres & age am I likely to be at the point of starting to have expensive faults appearing and is it possible that a faulty HPFP can lead onto further fueling problems ? I know, there are two questions here.

    Another one & I know it is extremely hard to tell, is it likely I could fit a new pump & sail along merrily for another 100,000 k or so.

    Has anyone replaced one of these themselves ?

    What range of prices have people paid for the replacement of one of these HPFP ?

    Before anyone gets started on me, I am fully aware that there are a whole lot of variables in these questions, however there are a lot of knowledgeable people out there that may be able to offer constructive opinions.

    Regards, Wayne

  2. #2
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    Not an uncommon issue in your age vehicle and generally one of the worst of them cost wise - assuming you have the improved oil pump fitted etc. The longer you keep it the more that will be needed - suspension struts, air compressor - the list goes on, but that’s cars for you!

    If you like the car then I’d fix it and assume you’ll get another couple of hundred thousand km from it. Good luck.

    Some on here have replaced it themselves but it’s a very fiddly job at the back of the engine. If you have to ask about it, I’d suggest you pay someone.
    2010 TDV6 3.0L Discovery 4 HSE
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  3. #3
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    If the original hpfp has done 240000km odd,its likely that a replacement (as long as its genuine) will do another 240000km.
    Id be replacing it and look forward to more motoring.

  4. #4
    BradC is online now Super Moderator
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    Quote Originally Posted by Journeytower View Post
    Has anyone replaced one of these themselves ?
    Diagnostic thread with all the painful "hoping for something else" and loads of people saying "it's the HPFP stoopid" : 08 D3 TDV6 P117D-00
    Of course they were all correct.

    Work log thread doing the job : Doing the HPFP. Questions.

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    I replaced both pumps, the HPFP and the Low pressure pump in the tank . I doubt the low pressure pump needed replacing , i just did both together as a precaution.

    My car would fault sometimes 3 or 4 times in 1km , and then it would run for for several hundred kms without issue. Hasnt faulted since they were replaced. Cant remember the name of the fuel injection place in Perth where it came from but they were about the best priced in Australia, I didnt want to wait for 1 to come from UK , but that option was a fair bit cheaper at the time.

    Bulletman

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    Thanks for the information & support guys. Bulletman describes very similar to what mine has been doing, go for months & not miss a beat then out of the blue the dash lights up with faults even though the car was running fine at the time. The last time gave me a nice 1000km ride in a tow truck with the caravan being towed, which is why I'm at the pointy point that I am.
    I guess I am just a little concerned that whatever the cause of the HPFP failure may have caused further problems down the fuel system, quite possibly unnecessarily by the look of it.
    Thanks again guys, well meaning & considered & delivered advice is always nice to get.
    Cheers, Wayne

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    depending on the nature of the failure in the HPFP (and cause thereof) there can be additional damage downstream, typically this is limited to the high pressure fuel regulator (not all cars have them some rely on a fixed orifice and controlling the pump) and the fuel injectors themselves. Compared to a HPFP typically neither are prohibitively expensive to have replaced (sensor) or checked out (injectors) while the HPFP is getting done.

    A workshop following best practice's should do some minor checking and if the HPFP fault is intermittant simply monitoring the performance of these items while the pump is not giving issues is usually a good enough method of testing to report on the viability of the componentry.
    Dave

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    Quote Originally Posted by Bulletman View Post
    I replaced both pumps, the HPFP and the Low pressure pump in the tank . I doubt the low pressure pump needed replacing , i just did both together as a precaution.

    My car would fault sometimes 3 or 4 times in 1km , and then it would run for for several hundred kms without issue. Hasnt faulted since they were replaced. Cant remember the name of the fuel injection place in Perth where it came from but they were about the best priced in Australia, I didnt want to wait for 1 to come from UK , but that option was a fair bit cheaper at the time.

    Bulletman
    I had the same issue, it’s written about in this forum.
    after speaking about it I opted for the more expensive HPFP than the gamble of the lower cheaper solution.
    wfter a year or so of those restricted performance and unreliability the 3k ish cost for the new pump solved the problem. That was about 120k km now at 170k km with no further issues

  9. #9
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    Thank you very much for that Dave. You have given me a couple of more things to consider.

    While I am now retired & not fully up to speed with the latest electronics I still can grasp things quite well and in all my years as a motor mechanic on cars, trucks, motorbikes, tractors & caravans I have never been afraid to ask questions and have usually found that there are knowledgeable people that are prepared to offer up considered information that through discussion has helped me & often times helped them with a different perspective as well.

    Wayne

  10. #10
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    Quote Originally Posted by BradC View Post
    Diagnostic thread with all the painful "hoping for something else" and loads of people saying "it's the HPFP stoopid" : 08 D3 TDV6 P117D-00
    Of course they were all correct.

    Work log thread doing the job : Doing the HPFP. Questions.

    Hi Brad, I just read your wonderful expose` of replacing the HPFP & I've got to say what an absolute terrific effort, Good On Ya, as others have said in different ways.
    You've convinced my good wife at least that WE should pay someone else to do the job. She said after the bruising & blood from doing the timing belts & oil pump I'd probably need a transfusion after doing the HPFP, also I shouldn't drink the amount of beer it would probably entail at the end of the day. Aspirin helps to keep me alive but not real good at holding the blood in.
    Thanks for a great insight.

    Wayne

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