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Just filled gas on Craftsmn 42" riding mower. Sputters, backfires and cuts off--intermittent. Water in gas? I see how to disconnect fuel line at filter. How do I clean out what's in the engine?

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There really isn't much "in the engine" what you could do is take the spark plug out and turn the engine over a few times. I would suggest flusing the tank and removing the bowl off the carb and cleaning it out.

Posted on Aug 19, 2010

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When i try to start it backfires and sputters its a husq 42 inch mower


Remove gas tank and clean thoroughly. You may have water in it. You will also have to remove carb. Bowl and drain along with any fuel in line to carb.

Jul 02, 2017 | Garden

1 Answer

Why my mower sputters while idiling and at times



If the gas is more than 30 days old, and it has been sitting in hot weather (90+), then it starts to go bad, rather quickly.

(And if no fuel stabile was added to the fuel before hand)


Or, if the gas can spout was not sealed properly in storage, it could have been water contaminated, from sprinklers or rain.


It may not necessarily be the motor itself.

The cheapest fix, is to drain all of the water out of the mower's gas tank. (you will still have some bad gas in the lines)


Put some fresh gas, with fuel stabile, in the tank and see if it will start. If it does, it may take a few minutes of operation to flush the bad gas out of the line, and motor.


That was the problem with my mower. It turned out to be a gas issue, and my mower was fine. Good luck.

Oct 16, 2013 | Husqvarna Zero Turn Mower Z5426

1 Answer

It spits and sputters and then cuts off whats wrong?


is it loosing spark when this happens?is the gas cap vent plugged no allowing fuel to flow?

May 03, 2012 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

The engine is backfiring in idle, more so when driving, even worse when blade engaged. Could there be water in the gas?


Yes you could have water in the fuel. Drain it and save it. Unless it is over a year old. You can pour the good gass off the top of the water after it settles. The biggest job after removing the fuel line from the carburetor and draining. Then removing and replaceing the fuel filter, is removing the carburetor floar bowl and removing the water inside, then cleaning the bowl. After removal, be carefull not to damage the hanging float. Dont use carburetor cleaner on the carburetor after you remove the float bowl, due to the rubber o-ring. It can't handle the chemical, it will swell to the point of it being to large to fit back in, and you will have to replace. Next, leave the fuel line off at the carburetor and fill the tank to wash out any trash in the lines. Once fuel starts to run ( catch it in a oil drain pan or empty oil can), then install new fuel filter, then reinstall fuel line on the carburetor. Problem should be solved. I as a preventitive and cleaner/stabilizer pour in some sea foam additive. :)

Aug 11, 2011 | Craftsman 42 in. Precision Cut Plus 24hp...

1 Answer

After running husquavarna riding mower 23hp mower starts backfiring and ends up quitting. mower will start back up but die out again as descibed.


I had the same issue and after trying everything I tokk the gas cap off and noticed there was negative pressure in the fuel tank when I broke the seal... I'm pretty sure the gas cap was just too tight, I threaded it back on but did not torque it down and the mower is running fine.

May 13, 2011 | Husqvarna 20HP Hydrostatic 42" Cut Riding...

1 Answer

Craftsman 19.5 HP Briggs and Stratton engine. Will not start. will start with starter fluid and then stalls. It appears no gas is getting to the carb.


disconnect fuel line from carb and crank engine. NO FUEL-check in-line fuel filter, kinked line, trash or water in bottom of fuel tank. FUEL- gas is stale, has water in it, or carb has sediment in bowl, bottom jet or idle jet.or float could be stuck shut.

Feb 09, 2010 | Craftsman 20 Hp 42" Deck Lawn Tractor

2 Answers

Mower runs good for fifteen minutes then the


Mine did this too. THe semi-transparent fuel filter will look like no gas is in it if you have the problem I had. The gas cap on the tank has a tiny breather hole to keep it from coming under a vacuum as gas runs out. Push thru it with a toothpick to clear the hole. That's all it was. But I did have some black debris clogging the filter and had same symptom.

Aug 26, 2009 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

3 Answers

Lawn mower dies


Find the fuel air mixture screw and while the mower is running turn so mower almost stops then turn them back till the moter is running smoother.Give it some throtle to see & hear how it is running

Nov 02, 2008 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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