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Check or replace your gas cap. Looks like it is not venting properly. Try it with the gas cap loose or adjust it occasionally while mowing.
always check your gas cap (especially if the motor dies after running a short time). You can simply run the motor with the gas cap a little loose to see if a clogged cap is the problem.
Hi Johnnymclaneutah thanks for viewing! It sounds fuel related from what you’re saying it will start so you have spark runs good for minute or so then cuts off. Is this after you had pressed the primer bulb and it starts and then cuts off shortly? If so classic sound of a carburetor that may have trash/water and/or a worn diaphragm. Which means a good gas tank and carburetor cleaning and you will need to replace that Diaphragm as well generally after you take off that carburetor if it has any age on it best to replace the diaphragm.
Pretty sure that would be same part # 5083 not sure if your local Home store carries these our local Lowes store does. The kits has a gasket, diaphragm, spring and a new screen in the kit as well. Pretty easy to install the kit also has directions on it. The main thing is just to be careful installing the screws back in to make sure they do go through the holes in the gasket and diaphragm. These engines are solid that probably will correct your problem for around $5.00!
Hi Harry Pappas thanks for viewing! This is Part # 5083K bought this at our local Lowes Home Center right at $5.00 USD. Your engine may also reference Briggs & Stratton # 495770 Carb. Diaphragm/Gasket/Filter or # 795083 as well. This part # 5083K will fit pretty much all the 3.5 - 5.0HP engines that have this type of diaphragm carburetor mounted on top of the tank. Pretty easy to do just be careful in putting the screws back in through the diaphragm holes to make sure its not misaligned
Yard Machine Mower Carb Diaphragm Replacement
The problem with your mower is definitely fuel issues. To help you further can you tell me what kind of carb is on there? Is it the float type carb or a vacu jet carb that's mounted right on the tank?
What you have then is a vacu jet carb. Take the tank and carb off of the mower by taking off the two bolts and the throttle linkage. Then drain the tank and take the carb off of the tank inspect the diaphragm and gasket for cracks or holes and to make sure it's not stiff an that the spring inside the carb is in good shape. If not a diaphragm and gasket kit is easy to obtain for less than 10 bucks. Clean out all holes in the carb and tank. Reassemble if it still won't start the carb is at fault and a new one runs around 20 bucks. Remember if you run the mower without the air filter you must still thread the bolt in that holds the air filter and cover on for the engine to run properly.
Looks like it was the diaphragm. Lowes.com says my local store has the gasket/diaphragm kit in stock for $2.98 so I'll be picking that up today.
The bottom of the gas tank was Very varnished so I soaked that for a while. Cleaned more, blew out with more air, reassembled, and it fired right up on the first pull!
Re: B&S 500 series motor won't stay running