Tecumseh 3.5hp only runs if you put gas directly into the carb, then dies.

Discussion in 'Mechanic and Repair' started by Pecker, Sep 30, 2004.

  1. Pecker

    Pecker LawnSite Bronze Member
    Posts: 1,454

    As you can tell from the title, 3.5 hp on my wood chipper isn't running right. It is missing the throttle linkage but that is on order and should be here tomorrow. But shouldn't it at least run anyway, although I know I would haveto manually hold the throttle open? It will only start if I tilt it back and pour gas directly into the carb. It runs for about 5 or 6 seconds, then dies, even with the choke off. It tries to respond when I open the throttle but it runs out of gas. Here's what I know:
    - there IS fresh gas in the tank and the tank is clean like a new one.
    - when I take the fuel line off the carb, fuel runs out, so it IS getting to the carb
    - since the throttle cable is missing, there is nothing connecting the governor to the throttle arm (but I dont' know much about how that works)
    - I've come to the conclusion that the carb is not siphoning gas through itself but don't know why.

    What does it sound like is going on here? I'm open for any and all suggestions. Thanks in advance.
     
  2. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Posts: 3,504

    look for a small tube coming from the crankcase and going to the carb. There is a rubber elbow on each end of the tube they become dry rotted and they dont allow the vacum to pull gas from the tank to the carb,I went threw this this past spring with my tiller
     
  3. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Posts: 3,504

    oooops been a long day, I thought you were having trouble with a briggs, not sure if the tecumseh is set up the same or not
     
  4. Pecker

    Pecker LawnSite Bronze Member
    Posts: 1,454

    That's ok. Thanks for the input anyhow. It doesn't have those tubes you were talking about. I hope it is something simple though.
     
  5. Aleman

    Aleman LawnSite Member
    Posts: 204

    I had the same problem with a push mower I have. Sounds like one of the jets in the carb is plugged, esp if it sat for a while with gas in it. Id pull the float bowl off and spray everything really good with some carb cleaner. Thats what fixed mine.
     
  6. Pecker

    Pecker LawnSite Bronze Member
    Posts: 1,454

    Ok. Thanks. I'll do that and let ya know.
     
  7. Pecker

    Pecker LawnSite Bronze Member
    Posts: 1,454

    Update: Well, when I took the bowl off, there's alot of varnish and crap all in there. So I took off the whole carb, tore it down and now it is soaking in carb cleaner. Pretty rough shape. Looks like maybe rain water found its way in or something because theres a bit of rust. Gonna try and get a rebuild kit for it and see where things go. I'll keep ya'll posted and thanks for your help.
     
  8. Pecker

    Pecker LawnSite Bronze Member
    Posts: 1,454

    Just wanted to update ya'll in appreciation to your responses. I tried to things mentioned. When I took the bowl off I saw lots of corrosion and decided to just buy a new carb at $59. It is supposed to be in tomorrow. When I get it on, I guess we'll see if it does the trick. Thanks again.
     
  9. P&C Lawn Care

    P&C Lawn Care LawnSite Senior Member
    Posts: 373

    You should have just bought a carb kit and rebuilt it. Not much to it really and this would have saved you a bunch. I have a chipper/shredder with a Tecumseh engine and I had too rebuild the carb too. Didn't cost $59.
     
  10. Pecker

    Pecker LawnSite Bronze Member
    Posts: 1,454

    Yeah, but I think I understated the corrsion factor. This carb looks like its been sitting on the bottom of the ocean. You wouldn't believe the corrosion on the inside. Its all caked up and carb cleaner has no effect on it. I had the dealer I frequent look at the numbers and come to find out its not even the right carb for the chipper so I don't know that it would've ever run right even if it were in good shape. Somebody let it get in pretty bad shape and I don't think it would ever run like its supposed to. Just to many cons to pros when I thought about it.
     

Share This Page