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How to clean fuel lines?

Discussion in 'The Hokey Ass Message Board' started by corsair, Dec 14, 2009.

  1. corsair
    Joined: May 16, 2009
    Posts: 287


    Tried searching, but probably didn't use the right keywords. What's the best way to clean out steel fuel lines? The tank was full of crud, I'm sure the fuel lines are too. Just not sure how to clean 'em.

    Can I cap it, fill it with seafoam or fuel injector cleaner and let it soak? Flush it with something else? Someone suggested "flossing" it with weed wacker cord. Seemed clever, but I couldn't get the cord very far up the line before it binds.

    What's the best way?

    Thanks guys!
  2. dannyego
    Joined: Mar 12, 2008
    Posts: 1,386


    in my experience I find it easier to just replace the fuel lines, it usually only takes a couple of hours and then you dont have to worry about it. Did you replace or clean out the tank? what was in there rust? sludge?
  3. PhoenixFear
    Joined: Dec 6, 2009
    Posts: 151


    On the '29 Model A I just used carb cleaner, however the fuel lines aren't but like a couple feet long. Just sprayed the heck out of them until nothing but clear came out.
    Probably isn't the best way but it got the job done. Maybe try something like pipe cleaners too for the ends.
  4. 4 pedals
    Joined: Oct 8, 2009
    Posts: 557

    4 pedals
    from Nor Cal

    Best way I've found is to Use them. Gasoline is an excellent solvent. Run a good fuel filter like the old brass ones Chevys used to have and expect to clean it frequently.

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  5. corsair
    Joined: May 16, 2009
    Posts: 287


    I like the last one. Same guy who recomended the cord trick said the use 'em plan wouldn't work. Go figure. Tank was full of rust. And some chunks of glass. And a couple of bleeder bolts. It was like cutting open the belly of a shark. I sent it to the radiator shop and need to put it back in.

    Brass Chevy fuel filter? Which ones?

    I think I'm going to see if I can get a 70's Bosch K-jet fuel filter. Mechanical fuel injection systems use kick ass fuel filters :)
  6. gimpyshotrods
    Joined: May 20, 2009
    Posts: 13,442


    True that. I first put one on my 1969 Malibu in 1987! It was originally destined for a 1980 924.
  7. Parts48
    Joined: Mar 28, 2008
    Posts: 1,649

    from Dry Heat
    1. Hot Rod Veterans

    I have never thought cleaning did anything but delay a problem..

    I replace...But that's just me..
  8. BrandonB
    Joined: Feb 24, 2006
    Posts: 2,715

    from nor cal

    Tried using an air compressor and blowing them out?
  9. JeffB2
    Joined: Dec 18, 2006
    Posts: 5,799

    from Phoenix,AZ

    Replace them, the tubing doesn't cost much.You have no idea the crap and varnish you will find in there,I had my tank boiled out because the car had sat for over five years I ran a yard stick into the filler and it can out like soft tar.While the tank was out I capped off the line up at the fuel pump fitting and sprayed Berryman Chemtool in the line till it was full and let it sit 3 days.I put a coffee can under the fitting up front and blew the line out with the compressor by the tank,over a cup of nasty goo came out,so I bought the new lines.
  10. jbrittonjr
    Joined: Sep 10, 2009
    Posts: 101


    Not much success with fuel lines, always wind up replacing them.
    Too much varnish or shellac like residue.
  11. 28TUDOR
    Joined: Jan 25, 2007
    Posts: 419


    Replace them, they are a lot cheaper in the long run.
  12. Deuce Daddy Don
    Joined: Apr 27, 2008
    Posts: 4,178

    Deuce Daddy Don

    Good advice!!!------Replace!!!!!!!
  13. Domino
    Joined: Jul 2, 2009
    Posts: 522


    <style type="text/css"><!-- @page { size: 8.5in 11in; margin: 0.79in } P { margin-bottom: 0.08in } --> </style> I am going to share my experience. I tried to cheap out due to poverty and just blow the lines out on my Galaxie. It worked fine for about a week until something in the line broke loose and stopped it up. I would disconnect the line and blow it out and get anywhere from a week to six months out of it. It never left me stranded, but it was a pain to have to keep doing it. This time I am going to replace the line to prevent this in the future. I measured my car and 2 pieces of 60 inch line should do it. I will join them in the center with a coupler and call it done. I have spent too much time on this to get held up due to $12 worth of lines.
  14. fab32
    Joined: May 14, 2002
    Posts: 13,990

    Member Emeritus

    I've cleaned out a couple by flushing laquer thinner through them. It's best if you can fill the line and let it set overnight and flush in the morning. That said it's always best to replace the line if you can.


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