removing varnish buildup metal fuel tank

Discussion in 'Outboards' started by eatsleepfish, Jun 10, 2014.

  1. eatsleepfish
    Joined: Jun 2014
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    Location: arkansas

    eatsleepfish Gone Fishing

    a few years ago I bought a 93 Nissan 18hp, an elderly man had won it in a raffle,,,he filled the tank ran it less then 10 minutes then put it up for 16 or 17 years , anyway, when I got the tank and motor I put that tank to the side, but now on a different setup I'm wanting a backup tank, but this mint shape tank has a varnish coating over the entire inside, my question is there something I can put in it that will remove the varnish from the inside, metal tank of course,,,, must be something I can get in the U.S.A. :idea:
     
    Last edited: Jun 10, 2014
  2. hoytedow
    Joined: Sep 2009
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    hoytedow Carbon Based Life Form

  3. hoytedow
    Joined: Sep 2009
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    Location: Control Group

    hoytedow Carbon Based Life Form

  4. philSweet
    Joined: May 2008
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    Yes, Seafoam, and put the tank in the boat for about a year before using it, or it can ride around in the back of your truck for a few months. There are also strong solvents that will work a bit faster, but they are nasty. MEK is one. I resuscitated an old motorbike with Seafoam. It had sat for six years. Rode it easy every day, reworked the carbs every night - for three months. Finally, the last bit of junk came out, so I took the bike out on the interstate and blew the motor. I have a Honda 1100 Shadow in pieces if anyone is interested. I've also seen a Racor 120 gph system hung on a ten hp outboard;) 2 micron oughta do it.
     
  5. eatsleepfish
    Joined: Jun 2014
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    Location: arkansas

    eatsleepfish Gone Fishing

    thanks, i'll use it, and thanks for the welcome, this site is very helpful...
     
  6. FAST FRED
    Joined: Oct 2002
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    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    I you dont have a year , I would spray (empty a can ) of brake cleaner and slosh for 10 15 min.

    After that , should anything be left lacquer thinner , overnight should get any remaining gunk.

    A small inline filter in the system would help for the first few fills, just in case.
     

  7. eatsleepfish
    Joined: Jun 2014
    Posts: 21
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    Location: arkansas

    eatsleepfish Gone Fishing

    thank you fred, I pray I got many years left, lol,
    but yes I'd love it way quicker, the thinner I'd thought about, but the braker cleaner then the thinner sounds like a great ideal, I was a carpenter most all my life so I just happen to have a few gallons of lacquer laying around,
     
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