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2.5tdiQ fuel filter

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by JimLoskot, Jan 21, 2011.

  1. JimLoskot
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    JimLoskot Member

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    [Jan 21, 2011]
    The car has been stinking of diesel last few days so had a look and there is diesel ontop of the fuel filter so I have got another filter and new valve (the pipes look ok, no splits etc..)
    I have never changed a fuel filter before so have a couple of questions:
    can I fill the new filter up with the diesel from the old filter?
    if not what is the best way to get diesel to fill it up with?
    do I need to bleed the fuel lines and how do I do this?
    anything else need to know?

    thanks very much
    Jim
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  3. swarcup
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    swarcup Well-Known Member

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    [Jan 21, 2011]
    when i did mine it went ok, what i did was remove all the pipes from the filter top, unclamp and change the filter then poured in new diesel from a tub bought from garage, plug all pipes back on and restart engine. I could here any air in the system self bleed out. Checked the Old diesel and put it back into fuel tank, it was clear and nothing in it. no further problems.
    I was nervous too about doing it as you here stories of the car not starting afterwards but nothing like that happened to me. im told that a short tow will start if you have problems
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  4. JimLoskot
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    JimLoskot Member

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    [Jan 21, 2011]
    thanks for that, just off to buy some diesel then
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  5. A4 nut
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    A4 nut Member

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    [Jan 21, 2011]
    DO NOT TOW START YOUR CAR! first bleed the filter and pump and then to the injectors tow starting with an air lock in WILL damage your PUMP do not DO IT!
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  6. JimLoskot
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    JimLoskot Member

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    [Jan 22, 2011]
    well just putting the spring clip back ontop of the valve and ping, off it went into the engine bay. damn it!
    will be taking the bottom off and hopefully it will be an easy find.
    #5
  7. adamss24
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    adamss24 Well-Known Member

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    [Jan 22, 2011]
    Actualy the tow start IS the best way to expell air from the VP44 pump. You do much worse to the starter, battery and pump diaphragm by cranking it in the hope it will start... Trust me, i am working with diesels for a very long time...
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  8. JimLoskot
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    JimLoskot Member

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    [Jan 22, 2011]
    well good news, I finally found it, just as I was about to give up. The valve was still leaking so I put the new valve on as well and it started up 1st time no problem.
    Very pleased
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  9. A4 nut
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    A4 nut Member

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    [Jan 22, 2011]
    Sorry to dis agree bleeding is the best way to get rid of air out of your fuel system not to tow start it, that is just me i may not have worked with diesels as long as some but i would not tell some one who i dont KNOW there ability to tow start it
    Last edited: Jan 22, 2011
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