Question about Briggs & Stratton Briggs Stratton Vanguard V - Twin Vertical Ohv Engine with Electric Start 23 Hp, 1" X 3 5/32" Shaft, ModelNo. 386777 - 0036 - E1

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Will start but wont idle even after running and warmed up

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If you left gas in it for an extended period of time without running, you may have a gummed up carb. The carb will need to be cleaned and rebuilt. Or replaced.

If this is more recent, and was running fine up until recently and suddenly it could be a simple problem.

If it starts and doesn't stay running it means it is not getting proper fuel mixture while running. Or the fuel may be poor.

Take these steps. If it does not remedy, let me know with a as many specifics as you can so I can properly help diagnose the problem.

  • put fresh high test fuel in it. Siphon the old fuel first.
  • Check to make sure Air filter is clean. If it is dirty it will choke the engine and make it run too rich.
  • Replace the spark plug(s). It may not be getting proper spark to stay running.
  • Check the fuel filter. It should be inline with the fuel line, next to the engine. If you have never replaced it, it may be clogged.
  • Inspect the fuel line to the fuel tank. Make sure it is not pinched.
  • Get some Blaster LMT from a hardware store. If you can't find it any where you can use gumout, although its not as good. Spray it into the air intake. Fill it up. Let it sit for 30 minutes or more. Try to start the unit. If it fires spray some LMT into the intake. Don't over do it. Hopefully the the LMT removed enough gum to get it to run.
Some tips to remember.

  • Never leave gas sit in a machine for more then 2 weeks.
  • If machine will be sitting for more then 2 weeks and not started, then either drain it and run it dry. Or use stabilizer in the fuel, and make sure the tank is full.
  • Use High test. It takes longer to break down over time.

Posted on Oct 15, 2010

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