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I have a 6 year old Stihl BR350. Thing ran flawlessly until last spring. It started to stall out randomly like it was out of gas. Sometimes it would burn the whole tank of gas without issue, sometimes it would stall out after 5 mins and anywhere in between. I thought maybe I got a bad batch of gas but it does it even with new gas and I run super with Stabil 360 and my trimmer and chainsaw take the same gas and run fine.

I am reading that the exhaust and spark screen might be clogged but those articles and videos link that to difficulty starting. My blower starts right up every time.

Any idea what it could be?

Thank you very much, any help would be greatly appreciated.

Could just be the fuel filter if it has one. All my small engines have them in the tank mounted on the main fuel line. Just a thought before you go nuts chasing the problem. Good Luck I've been down this road a few times and sometimes its the easiest thing that causes a problem.

The fuel filter and the spark plug are easy starting points. From there it could be a fuel line issue, carb issue, compression issue, or even ignition module issue.

With a 6 year old unit I would be changing the fuel lines and filter. Cheapest possible remedy and a good place to start.

ILENGINE said:

The fuel filter and the spark plug are easy starting points. From there it could be a fuel line issue, carb issue, compression issue, or even ignition module issue.

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It's a pain in the butt when an ignition module starts going out, if it doesn't just stop working completely.

@PTmowerMech I have been seeing a lot of faulty modules the past few years, and most of them never loose fire. they will act like they are running out of gas, or will start on the first pull and idle, but will die on acceleration. First that I came across would run about 20 minutes and would start bogging down until it died. If you release the trigger is would idle, and if you pulled the trigger it would start bogging down again, but would immediately idle if the trigger was released.

Had a similar problem on 2 pieces of equipment and found the fuel tank was not venting properly. Try leaving the fuel cap cracked and if the problem is gone, look at those fuel lines and the vent device.

make sure your muffler is not clogged, swap the plug and check to make sure the plug wire makes good connection, could be tarnished/corroided.

ILENGINE said:

@PTmowerMech I have been seeing a lot of faulty modules the past few years, and most of them never loose fire. they will act like they are running out of gas, or will start on the first pull and idle, but will die on acceleration. First that I came across would run about 20 minutes and would start bogging down until it died. If you release the trigger is would idle, and if you pulled the trigger it would start bogging down again, but would immediately idle if the trigger was released.

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Why would it die just from releasing the trigger? Coincidence that the module skipped at the same time you released the throttle?
I think I understand. It would have something to do with RPM's changing, and the chip inside the module, maybe?

PTmowerMech said:

Why would it die just from releasing the trigger? Coincidence that the module skipped at the same time you released the throttle?
I think I understand. It would have something to do with RPM's changing, and the chip inside the module, maybe?

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It is due to either the spark advance or rev limiting feature and the timing of the spark. Basically could cause firing at the wrong time,

I was getting fed up with mine, plus my shoulders are getting bad & it hurts to pull start.
I went to Greenworks 60v tools & have not looked back.

I think with the new advances in battery operated equipment it is the up and coming thing. Especially with occasional users where units set for long periods of time and gas will go stale and gunk up the carbs. Also with the older generation and ladies who are not able to pull start the gas units.

All tools are 60volts. I bought a self propelled 21" mower, string trimmer , blower, chainsaw, hedge trimmer, & an auxiliary power source. [ turns 60v to 300w of power. I am VERY pleased with everything & the cost was no more than gas powered. .