above idle

Discussion in 'Outboard Maintenance' started by Fuzzy_Bruce, Dec 27, 2008.

  1. Fuzzy_Bruce

    Fuzzy_Bruce Well-Known Member

    74
    0
    331
    Most embarassing, had a prospective buyer for the Gladesmen. Seemed to like what he saw. After 30 minutes or so I mentioned the ramp not 10 minutes from the house.

    Hooked up, went to the ramp. Did all the usual checks, pumped the line opened the tank vent, and on the second pull the 9.9 honda motor fired with the choke on. Usually it's a one pull, run for a minute, choke off and go for it. The motor acted like it was starving for fuel and wouldn't run above idle. Could this be an air leak in the fuel line? Do fuel pumps go bad and can they be home checked?

    Hoping it's something I can do but will take to the shop if no one can offer suggestions.

    Needless to say, the boat wasn't sold today, mostly because of my lazyness.
     
  2. iMacattack

    iMacattack busy, too busy

    4,674
    193
    2,268
    How old is the fuel and is it E10? :-?
     

  3. Fuzzy_Bruce

    Fuzzy_Bruce Well-Known Member

    74
    0
    331
    The gas is probably a couple months old and it's E9, E10, whatever it takes. Just kidding, The pump sticker said up to 10% ethanol.

    Guessing it may be the fuel, how would I dispose of about 3 gallons properly?
     
  4. Brett

    Brett > PRO STAFF <

    I had a motor that set for a couple of months,
    had the same symptom, turned out to be a fouled spark plug.
    Try a new plug, see if it makes a difference before getting expensive.
     
  5. noeettica

    noeettica Well-Known Member

    3,675
    106
    2,268
    Give it to a lawn care person ...
     
  6. Fuzzy_Bruce

    Fuzzy_Bruce Well-Known Member

    74
    0
    331
    He wouldn't have it!
    [​IMG]
     
  7. B.Lee

    B.Lee Well-Known Member

    Say it ain't so!

    I started to laugh like hell, then it just kinda fizzled out into sadness...

    Time to turn in the man card.
     
  8. BigAlPachecko

    BigAlPachecko Well-Known Member

    30
    0
    331
    Bump. I'm having the exact same problem (early 90's Johnson 6 horse). Fuel could be old, I bought the boat a month ago with the current fuel. But I did go from 8 ft fuel line to 14ft (moved the tank up under the forward deck). Wondering if the fuel pump is strong enough in that motor. I will try new spark plugs but does anyone else have an easy solution?
     
  9. Fuzzy_Bruce

    Fuzzy_Bruce Well-Known Member

    74
    0
    331
    Took awhile! It was the gas. Hard to beleive that a 6 gal tank could have enough fuel to go bad. Looks like a 10 micron water separator will be installed this weekend.

    Got a local job and probably won't sell the Gladesmen until I can afford a Caiman
     
  10. BigAlPachecko

    BigAlPachecko Well-Known Member

    30
    0
    331
    I think I might have figured out my own problem. I'm a new boat owner and forgot the starting procedure I was told by the previous owner. I had the tank vent closed. I'll bet that as my motor was trying to suck fuel out, the negative pressure created in the tank kept more fuel from making it down the line, thus starving the engine.
    Now that I am redfaced, I'll ask one more question. Am I supposed to close the vent when I'm not running the engine (on the way home?)
     
  11. Brett

    Brett > PRO STAFF <

    http://books.google.com/books?id=DxjizdHH5CwC&pg=PA48&lpg=PA48&dq=portable+fuel+tank+vent&source=web&ots=OHmKgYM6kY&sig=p9VW5cKx3Xyfo3QhPh53DEUzVuc&hl=en&sa=X&oi=book_result&resnum=5&ct=result

    Looks like the vent is supposed to be closed
    when transporting by hand, to prevent spillage.
     
  12. BigAlPachecko

    BigAlPachecko Well-Known Member

    30
    0
    331
    It might also need to be closed to keep the fuel from evaporating when it is just sitting around.

    Thanks for the tip. That's a nice resource for people like me.
     
  13. Brett

    Brett > PRO STAFF <

    You asked the question, I found the answer.
    Now we both know, works out well that way.

       ;)

    I wonder if closing it too tightly, when storing, might be a problem.
    Excess pressure might build up inside and cause gas to leak
    past the seals in the connectors.

    http://www.sceptermarine.com/marine_fuel_tanks/safe_use_english/

    Apparently vent cap is just for use when transporting from gas station to boat.
     
  14. BigAlPachecko

    BigAlPachecko Well-Known Member

    30
    0
    331
    You should start your own search engine.

    askBrett.com
     
  15. snooknreds2

    snooknreds2 Well-Known Member

    558
    0
    391
    Be careful having the vent closed all the time though. If you close the vent at night while it is cool out side and then the next day the tank is sitting in the sun the gas will actually expand the tank (if it is plastic). I have forgot to open my vent while storing the tank and found my tank looking more like a large red football then a rectangular tank. It was so over pressurized I am really surprised the tank did not crack or blow open