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Thread: Fuel filter replacement

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  1. Fuel filter replacement 
    #1
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    Do you need VCDS to prime the fuel system? Does it not self prime when you start the engine?
    57 A6 2.0 tdi 140 SE. Standard except for MMI Basic + and a remap by Expert Tuning, and a want list as long as the equator!
     
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  2. Fuel filter replacement 
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    Good query; I too am interested in the Answer. I am due a fuel filter change and want to do it myself. Have purchased a Mann Fuel filter... and I am familiar with the filter location and access arrangements. Is it a straightforward swap over and turn over engine to start...etc? .... 2.0 TDi C7 etc.


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  3. Re: Fuel filter replacement 
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    I have used my odbeleven to run the pump to prime the system. Didn't want to run the risk.
    You could try just cycling the ignition untill your satisfied it's primed.

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  4. Re: Fuel filter replacement 
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    If you go by the manual you should prime the system, however Audi dealers never bother and just turn the engine over.
     
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  5. Re: Fuel filter replacement 
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    Cycling the ignition does nothing on the CR engines.

    The pumps only run when cranking the engine & when running.

    So either make sure you fill the filter fully then crank ( risk damage to the HPFP ) or use VCDS to prime it. ( Best option )
     
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  6. Re: Fuel filter replacement 
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    Not really wanting to take any risks with this. I have obdeleven.... Is the ‘run fuel pump/prime’ function fairly straightforward/easy to find/use?


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  7. Re: Fuel filter replacement 
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    Quote Originally Posted by Gmonster View Post
    Not really wanting to take any risks with this. I have obdeleven.... Is the ‘run fuel pump/prime’ function fairly straightforward/easy to find/use?


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    From memory go to

    CONTROL UNITS
    ENGINE
    FUEL SYSTEM
    FUEL PUMP
    You then have option to prime the pump, you'll hear the air as the system purges. I did the prime function twice just to be sure, it runs the pump for between 1 and 2 mins.
    2015 A6 Allroad 218 - NEW
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  8. Re: Fuel filter replacement 
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    Cheers will have a look.


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  9. Re: Fuel filter replacement 
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    When I did mine on the 3.0V6, I started the engine, and it ran perfectly with no missfires or stumbles.
    So the pump appears to be able to cope with an air filter's worth of air, fire it back down the return, and not get any in the high pressure circuit.
    The must be a chamber that the HP pump draws from the bottom, the air rises to the top and exits via the return line.
     
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