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  1. #1

    1991 SP Fuel Problems

    Hi All!

    First post here, hope you can help.

    I have a 1991 SP with the Yellow 580cc. It has been sitting on the side of my house for the past 10 yrs. with the engine torn apart. I have now rebuilt the top half. Just tonight I tried to start it and it is not getting any fuel to the carb. When I put some gas into the top of the carb it fires up just fine.

    Not much fuel is getting to the fuel filter either. I know that the gas is good and there is enough in the tank. The carb is stock and has been sitting around the inside of the machine for the whole time that it was apart.

    What should I be looking for? What things could stop the fuel flow?

    Any help would be appreciated.

    Thanks,

    Scott


  2. #2
    getting waterlogged hotrod_sxty8's Avatar
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    I would say the carbs are toast and need to be rebuilt especially if they have been sitting for that long.

  3. #3
    Blackhardt's Avatar
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    I have to agree with DS650. After sitting that long the pump diaphragm has dried out and won't draw fuel. You didn't say if it was stored with fuel in the fuel system but if so then that has long since evaporated and you have alot of varnish in there. Go with a carb rebuild and I will bet it'll run fine. Karl

  4. #4
    getting waterlogged hotrod_sxty8's Avatar
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    you should also look at the pulse hose it might be loose or have a hole in it.
    the pulse hose is the one that goes from the engine block to the front carb it pumps air into the fuel pump to make it pump the fule for the carbs, if this hose is bad or leaking it won't work the pump....

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