1984 70hp johnson

Discussion in 'Outboards' started by Dave16, Jul 23, 2014.

  1. Dave16
    Joined: Jul 2014
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Ontario

    Dave16 New Member

    Hi
    I have a 1984 70hp johnson that I bought 2 years ago. Now it ran awesome until last week. Now I will prime the primer ball and it'll fill the carb bowls and then I'll fire it up. It starts no problem. But then after a minute or two it chokes itself out. I have cleaned the carbs. New plugs and fresh mixture of oil/fuel.
    I am baffled and have no idea where to go from here. If anyone has any ideas.
    Please help
    Thanks
     
  2. Ike
    Joined: Apr 2006
    Posts: 2,496
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    Location: Washington

    Ike Senior Member

    Sounds like it's not getting fuel. There may be an slight air leak in the fuel hose or primer bulb.
     
  3. Dave16
    Joined: Jul 2014
    Posts: 4
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    Location: Ontario

    Dave16 New Member

    I have changed all fuel lines and new fittings. And it hasn't changed much. Seems to run a slight bit better but not good. It still stalls everytime
     
  4. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    Check fuel pump. Diaphagm may be perforated. Or, first elevate a tote tank so it is higher than the engine, and see if that allows it to run. That would indicate it is the pump. You may have debris blocking the entry to the pump too.
     
  5. Dave16
    Joined: Jul 2014
    Posts: 4
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    Location: Ontario

    Dave16 New Member

    Where would the pump be located? Or what does it look like?
     
  6. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 482, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    The first thing you should buy next is a manual for this engine, like this one, for 30 bucks.

    [​IMG]

    Once you have it, run through the basic tuneup and diagnostic routines.
     
  7. Dave16
    Joined: Jul 2014
    Posts: 4
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    Location: Ontario

    Dave16 New Member

    I can't find them. Any dealership I've been to has a hard time getting their own hands on them
     
  8. Ike
    Joined: Apr 2006
    Posts: 2,496
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    Location: Washington

    Ike Senior Member


  9. powerabout
    Joined: Nov 2007
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    Location: Melbourne/Singapore/Italy

    powerabout Senior Member

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