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When i try to start the engine gas is pouring back into the breather box

Lots of fuel dumps back into breather box while starting and when it starts if it starts if it does start it runs poorly

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  • Motorcycles Master
  • 8,404 Answers

Off the top, I would say your carb float has sunk requiring replacement. Hard to tell much more since you dont say anything about make, model or year of your machine. You should take this motorcycle in for professional service.

Posted on Dec 06, 2012

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  • 2 Answers

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Posted on Jan 02, 2017

  • 2712 Answers

SOURCE: fuel leak

Wait... fuel is pouring out of the crankcase breather? Are you sure it's not the carb overflow tube? The crankcase breather should be going back into your airbox or through some kind of filter. If gas is coming out of there DO NOT START YOUR BIKE. It means that gas has gone from the tank through the carbs into the cylinder and is now in your oil. Thinned out oil is the devil for bikes. Sounds like you'll need to clean the carbs and set the float bowl height and maybe rebuild the petcock. Check to see if any fuel is coming out when the petcock is turned off. If it only has on pri and reserve then check for gas in the vaccum tube.,,

Posted on Nov 10, 2008

bubbyb
  • 2 Answers

SOURCE: carberators pouring gas into air box when engine is running.

seems as though the floats ar sticking

Posted on Dec 15, 2008

  • 69 Answers

SOURCE: fuel dumping

Sounds like a vacum issue with the tank, try starting the bike with the filler open, when you shut the bike off of no more fuel leaking then you may have a vacum issue with the tank. I have seen cases where the vent tube in the tank is clooged and it wont allow the fuel to return to the tank properly.

Posted on Mar 11, 2009

DickCanFixIt
  • 948 Answers

SOURCE: 1986 Suzuki GS 450 won't start

Take the carburetors apart and either rebuild them or clean them thoroughly.

Posted on Jun 19, 2009

  • 234 Answers

SOURCE: Gas pouring out of carb into air box

sounds like it take bottom of carb off and see if needle is stuck

Posted on Jul 29, 2009

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Ive replaced gas,gas lines,fuel pump on t1670 kubota.it would try to start before if you pour gas in breather.it stil does same with new parts.tried to run 1 time and died.what else could be wrong.


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Engine won't start, doesn't seen to be getting gas.


Potential 'air lock' - try running with out fuel tank cap on
Cap should have a fine breather hole in it

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Starts but will not stay running. smoke blows out the back, would this have anything to do with the gas/oil mixture?


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you could see if you have a friend that could help you bye starting the car for you and you need to un hook the top of air box as if you were going to change the breather take a small coke bottle and pour about 1 cup of gas in your bottle hold your breather hose up and pour about 1/2 shot glass gas down the hose and see if that alows it to continue to run if it does you may have a bad or weak fuel pump but I will warn you to be careful when dealing with gasoline do not go to overboard use your best judgement

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I have a 1995 Chevy suburban, and I'm trying to figure out why is it when we go to start the truck it churn and churns, so then we dump a cap full of gas in where breather is before it actually kicks off....


have you checked your cold-start injector? these injectors will just deliever one "squirt" of gas into the intake when starting the vehicle - much like your cap of gas down the breather does...

Jan 12, 2009 | 2002 Chevrolet Suburban

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No start turns over good has good spark


easy way to check if its getting gas is to take off the breather hose and pour some gas in then put it back on before you try to start it if it starts or even try's too then its fuel pump

Dec 16, 2008 | 1992 Jaguar XJ6

1 Answer

Fuel leak


Wait... fuel is pouring out of the crankcase breather? Are you sure it's not the carb overflow tube? The crankcase breather should be going back into your airbox or through some kind of filter. If gas is coming out of there DO NOT START YOUR BIKE. It means that gas has gone from the tank through the carbs into the cylinder and is now in your oil. Thinned out oil is the devil for bikes. Sounds like you'll need to clean the carbs and set the float bowl height and maybe rebuild the petcock. Check to see if any fuel is coming out when the petcock is turned off. If it only has on pri and reserve then check for gas in the vaccum tube.,,

Nov 10, 2008 | 2003 ATK 605

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