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  1. #1

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    SLT 780 engine full of gas

    Ski was sitting for 2 weeks, tried to start it this afternoon it wouldn't crank properly so I pulled the plugs and hit the start button... Didn't know the engine was full of fuel and it sprayed gas 10 feet in the air from all three cylinders, looking inside all three cylinders have gas on top of them, decided not to crank anymore because of all the fuel-air mixture in the hull, how do I get all this fuel out of the engine safely? I left the fuel selector in the on position so I am thinking there is a bad check valve on at least one of the carburetors??
    will the engine incur any damage if I leave it for another week?


  2. #2
    MSX 150 guy lives on Mr. GP1800's Avatar
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    Pull he plugs and crank the motor until nothing else comes out of the cylinders. Put the plugs back in and start the motor. If you turn off the fuel valve when the ski isn’t being used this won’t happen again. That’s what it’s there for

  3. #3

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    That's what I was doing but I got very concerned with the amount of gas spraying into the hull... I lay rags over top of the heads but they got soaked in seconds....my concern is that the hull is a very volatile mixture of fuel and air...I thought that perhaps the starter might spark?...which wouldn't be so good. Yes I know the fuel valve is there for a reason they forgot to turn it off... I guess I have a needle valve leaking??

  4. #4
    Click avatar for tech links/info K447's Avatar
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    Ground the spark plug wires!

    You do NOT want any sparks while you are clearing the engine of gasoline.

    Check all six connections for the heavy battery and starter motor cables. All must be clean metal to metal contact and nuts tight.

    If the engine will crank with the lanyard removed, then do not insert the lanyard while clearing the engine. And after clearing the engine, wipe up all expelled gasoline and properly dispose of the rags. Air ventilate the hull as much as possible before attempting to start the engine.

    Use common sense and caution.

    Have someone else standing by (but at a distance) with fire extinguisher.

  5. #5

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    Thx... I knew enough to keep the lanyard disconnected while cranking... this will have to wait until next weekend when I get back to the lake. I will check all the connections before cranking again, am I correct in assuming I have a defective needle valve? How does that much gas get inside the engine?

  6. #6
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by waterpest View Post
    Thx... I knew enough to keep the lanyard disconnected while cranking...

    this will have to wait until next weekend when I get back to the lake. I will check all the connections before cranking again, am I correct in assuming I have a defective needle valve? How does that much gas get inside the engine?
    Sometimes the CDI will Fire a Spark even though the lanyard is removed. Ground the plug wires also

  7. #7

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    Quote Originally Posted by K447 View Post
    Sometimes the CDI will Fire a Spark even though the lanyard is removed. Ground the plug wires also
    O crap didn't know that!..Thanks!
    Would a broken diaphragm on the fuel pump fill the crankcase with gas through the pulse line?

  8. #8

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    Quote Originally Posted by waterpest View Post
    O crap didn't know that!..Thanks!
    Would a broken diaphragm on the fuel pump fill the crankcase with gas through the pulse line?
    That used to happen to old snowmobiles. I assume it should be the same for your ski. By the way, does your ski have oil injection or premix?

  9. #9
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    Quote Originally Posted by Mockingee View Post
    That used to happen to old snowmobiles. I assume it should be the same for your ski. By the way, does your ski have oil injection or premix?
    Just had it happen a week ago to my 22hp briggs V-twin on the riding mower!!

  10. #10

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    Oil injection on the ski

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