Briggs and Stratton push mower engine issues

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  #1  
Old 06-23-18, 06:28 AM
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Briggs and Stratton push mower engine issues

I have a Murray push lawn mower with a Briggs and Stratton engine on it. It is a few years older but used on smaller lawn and has been well kept up. The issue is with the engine. It will run for about 10 mins just fine after starting on the first pull. Everything seems ok then just cuts out and acts like it runs out of fuel. That is where my issue lies. I can prime once or twice and will start right up again but will only run for a short time as it is warmed up. If we let it sit for a while it will run about the 10 mins again and do the same. I have tried the following.

1. I replaced the coil with a new one.
2. Tried running with gas cap open.
3. Cleaned Carb out and replaced all fuel in tank.
4. Put new gasket and diaphram on carb.
Tried again after each of these and still does the same.

So I thought I would fix it for sure by ordering a new carb for it. Got it yesterday put on and still does the same thing. So very frustrated as it seems like I have tried everything. It has a fuel tube that goes down into the tank. The screens are cleaned with the old and new one is clean as well. Please help me with any ideas that I could try. The oil level is at the high mark as well.
 
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Old 06-23-18, 08:12 AM
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Sounds like the fuel cap is clogged try running it with the fuel cap lose. Have a good one. Geo
 
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Old 06-23-18, 08:47 AM
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Originally Posted by geogrubb
". . . Sounds like the fuel cap is clogged try running it with the fuel cap loose . . ."
The OP said that he did that.
 
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Old 06-23-18, 12:25 PM
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Seems to me the part causing the problem is affected by heat due to expansion. Have you tried changing the spark plug?
 
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Old 06-23-18, 01:51 PM
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It does sound like vapor lock in the carb or fuel line due to heat exposure. Is the muffler rusted out or blowing towards the carb or fuel line? Is there a rusted out heat shied around the muffler?
 
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Old 06-23-18, 04:01 PM
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The second item listed...DUH.
 
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