Murray Mower starts then dies when i remove the choke

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  #1  
Old 07-24-06, 11:35 AM
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Murray Mower starts then dies when i remove the choke

HI I have a Murray mower with a 13.5hp Briggs & Stratton engine. When I start it with the choke on it starts up first time as long as the engine is cold. But as soon as I release the choke the engine stops. I checked the air flitter and it was dirty so I replaced it, that didn't work so I played with the mower for a while and if I hold my hand over the air intake to the carb the mower will start with out the choke on and as long as I limit the amount of air to the carb it will stay running and it sound good but of course as soon as I remove my the mower dies. Now saying all that I have no idea if all I did was just create a choke with my hand or if I determined that there is something wrong with the air filter intake system please help if you can

Thank you for your time

Dwayne
 
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  #2  
Old 07-24-06, 01:45 PM
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Dwayne:

You have it figured right - you simply created a choke effect with your hand over the intake. You activated the choke circuit.

It's likely you have the jets plugged inside the carburetor and it would benefit from a good cleaning, preferably with a bath cleaner.

Hope this helps
 
  #3  
Old 07-24-06, 02:43 PM
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As I was taking the carburetor off I disconnected the fuel line expecting there to be a lot of fuel pouring out but nothing came out this may sound like a strange question but there is a small white disk between the gas tank and the carb is this a filter if so how often should it be replaced and should the fuel just flow thru it. I got the mower parts list .PDF file from Murray and it doesn't show a filter or even talk about one anywhere I have pull schematics, for this mower and nothing I look at shows this disk.

FYI. I bought it brand new from homedepot two years and have made no modification.
 
  #4  
Old 07-24-06, 03:45 PM
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Sounds like you just solved your problem, an inline fuel filter, just go to HD or wherever and get a new one. Just to be sure, remove the filter and see if fuel flows freely before the filter, if so, you have saved a lot of hassle. Have a nice day. Geo
 
  #5  
Old 07-29-06, 02:59 PM
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Ok I found that the fuel line was swollwn shut so i replaced it so i have replaced the fuel filter, air fliter and cleaned the carb now it starts but it backfires alot then stalls after it back fires it sounds like it wants to keep running but it just can't seem to do it
also i just replaced the solenoid
 

Last edited by big_dog; 07-29-06 at 03:33 PM.
  #6  
Old 07-29-06, 04:14 PM
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Small engines don't normally backfire unless the timing is off, which in your case would indicate a sheared or partially sheared pin. Remove the flywheel, replace the pin, go back to work. Have a nice day. Geo
 
  #7  
Old 07-30-06, 05:44 AM
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Because the engine was running with the choke on I don't think there is a timing problem? Engines sometime backfire from lack of fuel! I think your problem is still in the carburetor or fuel pump. I haven't looked your engine setup up so I only say fuel pump because those white filters are for engines with pumps and the red ones for engines without! There is not much to cleaning a carb or a fuel pump. I think you'll find a Little rust or grit in the bowl. That stuff get's stuck in the jets and your fuel flow is restricted. That's my best suggestion and is premised on you having a clean tank, new fuel line a new white filter and fresh clean gas!. Unrestricted fuel flow to the pump and/or carb. Good luck, Ron
 
  #8  
Old 07-30-06, 07:34 AM
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ok the filter that i used to replace the white one is a red one i didn't know that there was a differance and every store i went to said that the red one was just the replacement for the white i will see if i can find a white one in the meantime i will try cleaning out the carb again.
 
  #9  
Old 07-30-06, 06:05 PM
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Its not the filter.... they make red or white of the same thing.
It sounds like the carb, you've just fixed the other things that were in the way.
 
  #10  
Old 07-31-06, 12:44 AM
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V8driver the man said his "fuel line was swollen shut"? You don't think that needed fixing?

Yes, the red & white filters are made of the same thing but Briggs recommends the white filter for use with fuel pumps and the red for engines without fuel pumps!

In a previous post I said "I think your problem is still in the carburetor or fuel pump. I haven't looked your engine setup up so I only say fuel pump because those white filters are for engines with pumps and the red ones for engines without!" was this in error?

IF there is a fuel pump it should be checked and depending on it's age and condition the diaphragm and springs replaced. (Be VERY careful taking these apart. There are two small springs, one on each side of the diaphragm, that can disappear real easy!)

The carburetor IS more than likely the problem and has been. While you can probably blast the main jet one time with carb cleaner and compressed air and the problem will go away it would be much better to clean the entire carb and install a repair kit.

I learned everything I know about small engines, with few exceptions, right here on this forum so if I'm wrong, I learned it wrong here!

V8driver I don't mean this to sound negative, I just want to be sure I get it right next time I have this same problem or advise someone about this problem. Maybe you could correct what I am misunderstanding? Thanks in advance.
 
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