1982 Aztec IMP gas tank replacement

Discussion in 'Gas Engines' started by donald callies, Nov 21, 2019.

  1. donald callies
    Joined: Nov 2019
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    Location: mule creek ne mexico

    donald callies Junior Member

    Hi, I recently picked up a 1982 Aztec IMP. The gas tank I think is leaking. How do I replace it ?

    anyone can help me ?
     
  2. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    Is it "glassed in" ? You can't unscrew a panel and inspect it ?
     
  3. donald callies
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    Location: mule creek ne mexico

    donald callies Junior Member

    I do not know. I have not looked under the carpet. There is a storage compartment next to it.
    I have books etc on everything except the boat construction diagram
     
  4. donald callies
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    Location: mule creek ne mexico

    donald callies Junior Member

    been cold n raining for couple days, soon it warms up I will be working on looking
    for an inspection plate.
     
  5. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    Boats with "glassed in" tanks can be a real problem if they develop a leak, as getting them out can create a risk if a spark ignites vapours. Anyway, first check for access.
     
  6. donald callies
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    Location: mule creek ne mexico

    donald callies Junior Member

    Yes it was kinda scary seeing all that gas under the motor. I pulled the plug instead of using the bilge pump
     
  7. fallguy
    Joined: Dec 2016
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    Location: usa

    fallguy Senior Member

    Pump the tank out with a gas transfer pump.

    Fill the bilge water and drain it.

    Open all bilge access to the environment. Consider running a fan into the bilge..

    wait a week, smell for vapors

    Cut as needed, if needed. Keep a fire extinguisher on hand.

    some ideas
     
    Last edited: Nov 21, 2019
  8. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    You can pressure check fuel tanks for leaks fairly easily, by stopping off the breather, ensuring the filler is screwed down tight, and attaching a fuel primer bulb opposite way round, to the outlet hose. A few squeezes should harden up the bulb, and it stays hard, if it does not, there is a leak somewhere.
     
  9. BlueBell
    Joined: May 2017
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    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    And you can use spray soap to find the leak(s).
     
  10. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    That is so bluebell, but I was more thinking about tanks in situ, you can't easily get to, though if there is fuel in the bilge area, it is pretty likely there is a leak in the actual tank.
     
  11. donald callies
    Joined: Nov 2019
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    Location: mule creek ne mexico

    donald callies Junior Member

    Ok folks, I sure appreciate all the replies. Damn am lucky this thing did not catch on fire. At least 10 holes in the bottom of the aluminum tank. I see old sea salt crystals. It was quite simple to remove, already found a replacement in eBaY. Sure is a nice cuddy cabin 21 foot boat, complete 350 chev engine new block new everything / Mercuiser rebuilt / 4 new tires on the trailer / new bilge pump / I might sell it after I get it in tip top shape. Till next time ===> IMP moon-phaze
     
  12. Mr Efficiency
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    Location: Australia

    Mr Efficiency Senior Member

    That was relatively easy work, by the sounds. There is something to be said for non-metallic tanks, corrosion isn't an issue.
     
  13. donald callies
    Joined: Nov 2019
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    Location: mule creek ne mexico

    donald callies Junior Member

    Certainly, I am replacing it with a plastic tank. Also it was poor boat design, tank sat flat on bottom. Thinking there should be a 1 or 2 inch rubber drainage mat under the tank. The space provided was exact size of tank. I had to go to a smaller tank, but oh well.
     
  14. fallguy
    Joined: Dec 2016
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    Location: usa

    fallguy Senior Member

    Plastic needs at least 2% expansion area l &w, and even more up. 3% is the manufacturer advise. I pressure test the tank at 2-3# and they rise up pretty high.

    Also, make sure nothing sharp is in the expansion area.
     

  15. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    The alloy and SS tanks not infrequently go from the inside.
     
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