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Thread: Can a High Pressure Fuel Pump just fall off?

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  1. Can a High Pressure Fuel Pump just fall off? 
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    Hello All

    I have a 2005 Audi Avant 2.7tdi with 129K miles and a number of problems - limp mode with glow plug warning light and emissions warning light.

    I've just had the glow plugs and inlet manifolds changed over and while doing the job it was clear that the bolts form the high pressure fuel pump had come loose and the unit was moving around on it's brackets.

    In January 2015 MDM replaced a broken bracket and removed a broken stud and fixed the issue with new audi parts however in just over a year all the bolts have come loose.

    https://youtu.be/u4VOGOBj_BQ

    I have search the internet and this forum but not found any mention anywhere.

    Is this a common issue with Audi HP Fuel Pumps?
     
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  2. Re: Can a High Pressure Fuel Pump just fall off? 
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    OK after a little searching around I found "2004 - 2006 the crankshaft vibration damper was poorly produced"

    Excuse my ignorance but does the same belt for the crankshaft to the fuel pump (as well as alternator, water pump, power steering pump and air conditioning compressor)?

    It may well explain why the original problem with the HPF pump i.e. a broken bolt and cracked bracket might have happened. And why the bolts have come loose again.

    thanks
    Matt

    thanks
     
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  3. Re: Can a High Pressure Fuel Pump just fall off? 
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    That a is a different belt.
     
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  4. Re: Can a High Pressure Fuel Pump just fall off? 
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    If the threads to the bolts holes are worn then the pump could fall out especially if the bolts were over tightened when fitted.
    Dan
    2009/2010 2.0 TDIe SE
     
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  5. Re: Can a High Pressure Fuel Pump just fall off? 
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    Quote Originally Posted by B5NUT View Post
    That a is a different belt.
    thanks for clearing that one up, shame I thought I may have hit on the answer.
     
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  6. Re: Can a High Pressure Fuel Pump just fall off? 
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    thakns for the input, I will suggest on sorting it out they use threadlocker cheers
     
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  7. Re: Can a High Pressure Fuel Pump just fall off? 
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    Hi there,

    Sorry I know this is an old thread but I have the same problem and its driving me insane!

    I see the OP is no longer active on the forum but am wondering if anyone else has had this..? Mine has come loose twice now and its such a pity as otherwise I am loving the car! ('06 A6 2.7Tdi Saloon BPP Engine)

    If anyone has some advice I would be really grateful!
    Many thanks
    Denis
    2006 A6 2.7Tdi Quattro Saloon BPP Engine
     
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  8. Re: Can a High Pressure Fuel Pump just fall off? 
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    I would get new bolts and apply thread lock, that should resolve the issue.
     
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  9. Re: Can a High Pressure Fuel Pump just fall off? 
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    Hi B5NUT,

    Sorry long time to reply, thanks for suggestion.

    I have pump back on car, but have only driven it rarely in the past while. I originally thought there was vibration elsewhere that was causing the pump to shake loose and fall off but after looking at it again with some friends, I have to accept it could be the pump itself. When I had the car in an engineering/fab shop to get new sleeve and fasteners welded/drilled onto the engine, he said he thought the damper pulley and belt pulley were not running true, and this could be caused by play in the shaft etc. (He put a dial runout gauge onto the pulleys while the pump was held in a bench vice).

    So to cut a long story short I am getting a 2nd hand pump and should be able to fit it next week. Yes theres a risk with anything used, but in general the CP1 pumps seem to have few issues...

    I have a Vag Com cable coming from Gendan also, and have emailed Ross Tech on how I might be able to code in a different pump. I will use new bolts and thread lock when I fit it.

    BTW to B5NUT - your build thread was absolutely EPIC, I am hoping to carry out a few mods similar to yours!
    Cheers
    Denis
    2006 A6 2.7Tdi Quattro Saloon BPP Engine
     
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  10. Re: Can a High Pressure Fuel Pump just fall off? 
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    Dengsx, your 2.5TDI uses a different pump system, a so called VEP unit (VP44) and the other cars in this thread are common rail with a single output high pressure fuel pump.
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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