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this link shows how to rebuild a carb. I suggest cleaning the jets before you try anything else, if you havent done so already. At the bottom of the carb there is a not that holds the bowl in place. Remove yhe nut and bowl. In the nut there are tiny holes, clean them out using a wire (bread tie will work) you can also use an air compressor, A shot of carb cleaner wont hurt. More often than not this is the cause of most small engine issues. How to Fix Lawn Mower Carburetor eReplacementParts com
Its the carburetor. Needs to be cleaned. But try this first. On the bottom of carb is a round bowl with a bolt holding it on .If snowblower has gas in it clamp fuel line to stop fuel leakage. Remove bolt and pull bowl down slowly. Look in bowl to see if there is water at bottom under gas.To be sure dump out fuel and clean out bowl with clean rag and some air. Next place a small piece of tube in bottom of carb that you took bolt out to hold bowl on. Blow air in to remove any dirt and reassemble carefully and refuel carb and start engine. Good luck.
There are two plastic nipples that are pressed into rubber grommets, just grab the bottom and pull straight out while wiggling the air box assembly. Make sure you pull the rubber fuel lines out of the way so that the air box cam come straight out. The resistance you are feeling is either the rubber grommets or the fuel lines in the way. I have had mine apart a dozen times!
Not a big deal. Im assuming this is a 4-stroke push mower and not a leaf blower. Remove the air box cover, air filter, and air box back plate. Careful there is a gasket on the back of the backplate that if damaged the primer bulb wont work, part # 272653. Remove the fuel line from the carb and drain the tank. Using a 1/2 inch wrench remove the bowl nut from the float bowl on the carb, hold the bowl to the carb as to not break the gasket seal, drain the bowl and replace the bowl nut. If you tried to run the unit and oil is in the cylinder remove the spark plug ( clean the spark plug) and spray some carb cleaner in the hole and pull the starter rope several times to purge the cylinder. Reinstall the spark plug, reattatch the fuel line, install the air box back plate ( leave the air filter and cover off for now), add fresh fuel. Take unit outside and start, you may need to give it a shot of carb cleaner in the throat of the carb to help it start. It may smoke, it may blow oil out the muffler. Let it run until it quits smoking ( usually around 5 minutes) . Shut it off and complete assembly. It should be fine.
remove air filter and see if your carb has a float bowl on the bott. of it, if so remove bolt on the bottom center and carefully pull the bowl off next clean the bowl out with carb cleaner, then the nut that holds bowl on has tiny holes in it, take a bread tie wire and carefully clean these holes out, then, lift your float up slowly and see if gas quits running out of carb, then lower the float a nd gas should start running again, then carefully put bowl back on and tighten up nut on bottom and put gas in.
The black plastic cover is the foam air folter holder, once the two nuts are removed, there is nothing else holding it on, it maybe the nuts have burred the plastic around the studs, grab the black cover and just pull it off, it may take more force than you might expect.
the engine is not getting enough gas. when you hold down the primer you are bypassing this problem. to fix this simply adjust the carb's fuel screw, located on the side of carb, a little at a time until runs smoothly.