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  1. #1
    Senior Member Three Rings mad70sx's Avatar
    Join Date
    Mar 12 2009
    AZ Member #
    39786
    My Garage
    Silver '04 S4
    Location
    Lil Rhody

    DIY: B6/B7 Broken Fuel Filter Line Replacement

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    A little while back I replaced my fuel filter and in the process I broke the return line fitting at the filter. Been hanging on with a cable tie ever since.

    I asked my dealership to fix it,thinking it would be relatively inexpensive for them to repair. WRONG!!! They quoted me approx $1200 to replace the line! I nearly crapped myself on the spot! They said that they would have to drop the exhaust,driveshaft and gas tank to replace the line. mmmkay...I politely told them no thanks and proceeded to figure out how to replace the line myself. I searched the forums but found very little on how to replace one of these lines.

    I ended up costing me $90 for the replacement fuel line(from World Impex)and about 2 hours of my time.(taking my time,too.)

    I know other people here have broken fittings on the lines to their filter from what I've read here. Hopefully this might save someone some $$$ down the line

    Heres how it did it.

    First,it might be easier to place the rear of the car on stands to access the fuel filter under the car. After that remove the panel covering the filter.

    Remove the rear seat bottom to access the panels that cover the fuel sending unit and fuel pump. The seat is easy to remove. Just pull up from underneath it and it should come free. The two black rectangular holes at the front of the seat is where the seat cusion secures to. Pull straight up on the seat cusion at these locations to free it up. The access panel behind the passenger seat is where the sending unit is.(and the return line I need to replace) The access panel behind the driver seat is where the fuel pump lives.


    Passenger side access with sending unit.


    Driver side access with fuel pump.


    Next,disconnect the line to be replaced on the sending unit and cap the open port. If a tool is needed to remove the fitting a small screwdriver will do the trick. BE VERY CAREFUL IF YOU USE A TOOL TO DO THIS! The fitting can break easily! Thats what got me into this mess in the first place. I believe there is also a specific tool that will release these type of fuel lines.


    Cap the port to be safe. Only a small ammount of fuel dribbled out of the line. I did remove the gas cap prior to release any potential pressure.(don't know if removing the gas cap really does anything,tho)


    Next,I had to loosen and remove the two bolts on the gas tank straps on the passenger side to gain more room to remove the old line and snake the new line down. I has to gently pull down on the gas tank from underneath to remove the old line. A 1/4" of play seemed to be all I needed.

    bolt facing the front of the car.


    Bolt facing the rear of the car.


    It was still a little tight snaking the new line in. I had to push gently on the top of the sending unit to push the tank down slightly and the line dropped down easily.


    The hard part is over!

    Connect the fuel lines,strap the gas tank back up,fire up car to check for leaks,put panels back on sending unit/fuel pump,re-install panel covering fuel filter,re-install seat cushion,lower car. All done.

    The lines on the sending unit are easily replaced,imo. They are less than a foot from the filter and sould be easily snaked down.

    The line on the fuel pump could be the one that screws you. It runs crosswise to the car on it's way to the filter. There may not be enough room to snake the lines fitting through. In that case you may indeed need to drop the exhaust,driveshaft then the fuel tank to gain the room needed in order to replace it. Possibly removing the straps from both sides of the tank may give enough room.

    That's it,hope it helps someone. Feel free to comment or make corrections.

  2. #2
    Veteran Member Three Rings
    Join Date
    Mar 01 2004
    AZ Member #
    1020
    My Garage
    2004 Audi S4, 1997 Audi A4 1.8
    Location
    Northern NJ

    Re: Broken fuel filter line replacement DIY

    Nice job, very easy to break stupid clips like that, and Audi seems to know how to make stupid clips!!! Coil packs, foglights, any and all locking tabs are ridiculous to easily remove!

  3. #3
    Account Terminated Four Rings
    Join Date
    Mar 09 2005
    AZ Member #
    5637
    My Garage
    Widebody S4 Noobs Destroyed: 9
    Location
    Santa Clara, CA

    Re: Broken fuel filter line replacement DIY

    This is a great write up for those who will fuck their lines up :P

  4. #4
    Account Terminated Four Rings
    Join Date
    Feb 29 2008
    AZ Member #
    25855
    Location
    NJ

    Re: Broken fuel filter line replacement DIY

    Excellent write up! Thanks!

  5. #5
    New Member Two Rings Pedros4's Avatar
    Join Date
    Nov 04 2008
    AZ Member #
    34933
    My Garage
    2005 Audi S4 imola Yellow
    Location
    Lowell,Mass

    Re: Broken fuel filter line replacement DIY

    where is the filter located looks like somewhere in the front "area"
    2005 b6 imola yellow S4 6mt...loving it

  6. #6
    Senior Member Four Rings beemercer's Avatar
    Join Date
    Aug 14 2008
    AZ Member #
    31944
    My Garage
    05 Jeep GC 5.7 Lmtd. QDII - Oh-One Fat-Body Four-Two
    Location
    Central Mass

    Re: Broken fuel filter line replacement DIY

    Quote Originally Posted by Pedros4 View Post
    where is the filter located looks like somewhere in the front "area"
    It's immediately in front of the rear passenger side tire, you can see the lines without actually removing the panel. In fact if you are on stock suspension you can do the whole fuel filter job without lifting the car.
    RIP Sway
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    You represent the idiocy of today.



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