scag tiger cub flooding

Discussion in 'Mechanic and Repair' started by michael30512, Jul 28, 2011.

  1. michael30512

    michael30512 LawnSite Member
    Posts: 7

    i work as a small engine mechanic. we have a tiger cub that keeps flooding, we have replaced the fuel pump, brand new carb($341) and everything else we can think of and it seems like there is a vacuum problem because it runs ok gravity fed but the pump works off a vacuum to the engine, i don't know. somebody please help!!! it keeps flooding!
     
  2. dlawncare

    dlawncare LawnSite Member
    Posts: 0

    make sure that the fuel cap is venting
     
  3. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

  4. michael30512

    michael30512 LawnSite Member
    Posts: 7

    We did , we had the gas cap off completely off. Still same results. We also changed all the fuel line but its gettin to much gas, its not that its not getting enough. Its got me stumped!! ???
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  5. michael30512

    michael30512 LawnSite Member
    Posts: 7

    head gasket???
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  6. retrodog

    retrodog LawnSite Silver Member
    Posts: 2,420

    We had an engine that gave us fits like that, and after doing all the technical stuff possible, we noticed there was a small little line that ran off the carb that looks like a fuel line, but it releases fumes, just goes to nothing. It had a little dirt stopping it up, and was causing it to run terrible, felt like a fuel issue. We even went as far as check the new fuel pump we had ordered to make sure it wasn't defective out of the box...lol. I originally thought it was the gas caps not venting, its weird how your gut instinct is usually right on the money we just have never even thought of that, you might really look over the motor and look at every little line..
     
  7. michael30512

    michael30512 LawnSite Member
    Posts: 7

    that is for sure worth looking into, we've already spent over 500$ trying different approaches on this problem. Ill be mad at myself if it is something that simple. Especially since we have the head off right now changing the head gasket.
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  8. michael30512

    michael30512 LawnSite Member
    Posts: 7

    wow, thank you retrodog you are a life saver. It ended up being a small hose on top of the carb that goes to nothing. Who would have thought thats what it was. We have replaced the head gasket, cleaned the carb , replaced the carb , replaced all the fuel line, all the filters, and everything else you can think of and it ended up being the smallest thing. Thank so much for that advise.
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  9. steve4mc

    steve4mc LawnSite Member
    Posts: 22

    Once again we see the despicable nature of mud-daubers or some around here call them dirt dobbers (and no, I don't know the correct spelling). They love to fill any kind of small round hole with mud and dirt. Any kind of vent opening is a prime candidate. I once had one fill a vent hole off of my sportster oil tank. It built up pressure while running and couldn't release the pressure until I took off the rubber plug to check the oil. Got a nice shower of warm oil.

    This is the reason I like the kinds of spiders that prey on wasps.
     
  10. michael30512

    michael30512 LawnSite Member
    Posts: 7

    I know they get into everything. You should see all the things I take apart and find dirt stuffed up into. And if its not that its a rats nest or birds nest. Thanks again for all the help.
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