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My Snapper S31SNG will not start after replacing carb.

I've replaced the purge bulb and fuel lines.  Too many neighbor's hands have gotten me totally confuse on it now.  HELP!!

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  • wadamarine May 22, 2009

    It will start most times the starter cord is pulled and runs briefly about 20-30 seconds in half choke.  When opening the choke fully, the unit stalls out.  Also, where/how should the little plastic piece on the fuel be placed in the fuel tank?

  • wadamarine May 22, 2009

    There must be a bigger issue here.  I'm still having difficulty with it running beyond the half choke position.  Thanks for the assistance.

  • wadamarine May 25, 2009

    I just purchased this carburetor in hopes it would fix the problem but it didn't.  I figure the issue has to be more severe.

  • wadamarine May 25, 2009

    I purchased it brand new.  I know that is not necessarily saying its a good carburetor just because it is new.  I've purchased new items in the past that were defective.  

  • Jim Parker
    Jim Parker May 11, 2010

    When was the last time it started and how did it react at that time?

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  • 1,040 Answers

A short fuel line leading from the primer bulb should be placed just inside the tank. This line may be larger than the other fuel line depending on your trimmer, so make sure that you have the correct sizes. The small plastic piece goes at the end of the fuel line to prevent it from pulling out of the tank. It also serves as a overflow. Cut this line a little longer than you need it until you get it in the correct position. (Hint: You may want to taper the end of the lines before putting them in the holes, it makes it much easier to feed them into the hole, then square them up after they are in.) The other line goes to the bottom of your tank with a small filter at the end.

Posted on May 22, 2009

  • 2 more comments 
  • Jim Parker
    Jim Parker May 24, 2009

    You have a carburetor problem. You need to take your carb. apart and clean it. Use a DenTech brush, (used for teeth cleaning), to clean the small ports. You may also need to purchase a carb. kit for your Snapper and replace the gaskets and needle valve. Make sure to clean the small screen in carb. It can get clogged very easy. If you purchase a carb. kit, the screen should come with it. Clean the carb. with a can of carburetor cleaner. You may as well replace the air filter as well because you could complete this job only to have to tear it all back down again because of a dry rotted filter. Old filter pieces can come off, and get sucked off into the carb. Let me know how you do. It sounds difficult, but it really isn't. It should only take about an hour.


  • Jim Parker
    Jim Parker May 25, 2009

    Did you purchase a new carburetor or a used carb. If it's used it may have the same issues as yours.

  • Jim Parker
    Jim Parker May 26, 2009

    There are only a couple of things that I can think of at this point. (1.)The filter that is attached to your fuel line in the gas tank is clogged and won't take in any fuel; (2.) The gas cap is clogged, causing the air supply to be cut off to carburetor. The thing that tells me that this is not your problem is if your gas cap is clogged, the trimmer should run for approximately 10 minutes before shutting off. The way to tell if this is your problem is if when the gas cap is removed, you here a suction sound from the gas tank. Or (3.) The fuel line leading to the carb. is to large. It should be replaced with the same diameter line. I'm leaning toward (1.)Hope this helps.

    Jim

  • Jim Parker
    Jim Parker May 27, 2009

    Thanks for your rating "wadamarine. AND THANK YOU FOR YOUR SERVICE TO OUR COUNTRY!! If you should ever have any questions on drywall finishing, or know someone who does, put your questions to "Tools-Building & Power-Hand Tools.

    Jim


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This is an ongoing issue for users, and rightfully so. Small diameter line out of fuel tank (has filter in-tank on end) connects to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then pushes any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Years ago on 2-stroke trimmers, primers were not even used,...you choked the carb with a slide lever and gravity let fuel enter the carb from above...a few pulls, a "pop"...slide it off of choke and away you went.
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http://www.partstree.com/parts/?lc=snapper&mh=19

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