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Remove air filter and pour a small amount of gas directly into the carb. Try syarting. If it runs then dies off you either need a carb rebuild or you have no fuel getting to the carb. Please be careful as if it backfires the fuel can catch fire. It only takes a very small amount...a teaspoon or so for this test.
If you are lucky, you might just need new fuel filter and the fuel bowl cleaned out, and maybe new air filter. If not so lucky you need carburetor rebuilt. Backfire is usaully caused by engine running too lean ( too much air for the amount of fuel present). Fuel bowls get gunk in them and the fuel needles and fuel jets get varnished up. The accelerator pump gets worn out gaskets and/or bellows and doesn't give the right amount of fuel mist when you accelerate.
Full Choke is indicative of a motor starved for fuel
If the engine surges and won't run without choke it is starving for fuel. Best place to start is the fuel filter. After the fuel filter, pull the fuel line off of the carburetor and place a container under the fuel line to catch the fuel. Crank the engine over and watch for the amount of fuel being pumped through the line. There should be a good stream of fuel with each pulse from the pump. Chances are the pump diaphragm is getting weak and it cannot keep enough fuel in the carb to run proper. Check those items and let me know if it helps, Daniel.
not getting gas, since gas is going to carburetor then the carburetors float/needle is not working, will need to clean/rebuild/replace carburetor. I am assuming that the mower sat awhile with gas left in it and the gas has gummed up the carburetor, sometimes it will clog the lines,filter and pump, you can use carburetor cleaner to clean it up and you may want to try blow air through the ports, Good Luck Tim
Yes, Your carburetor sounds like it needs cleaned. Or you may possibly need to purchase a carb. kit for your trimmer if the cleaning doesn't do any good. When cleaning the carb. use a Den Tek Brush, (teeth cleaning brush), to clean the small ports. Also, check the small screen in carb. Can get clogged easily.
I HAVE PERSONALLY CHANGED A FEW THROTTLE POSITON SENSORS IN THESE VEHICLES. BUT BEFORE YOU DO THAT, TRY SPRAYING SOME CARB AND CHOKE SPRAY IN THE THROTTLE BODY WHILE THE CAR IS RUNNING. YOU MAY HAVE TO HOLD IT AT A HIGH IDLE SO IT DOESN'T DIE ON YOU. THIS SHOULD HELP TO REMOVE THE CARBON IN THE THROTTLE BODY. IF IT STILL WANTS TO CHOKE, THEN CHANGE THE T.P.S. HOPE THIS HELPS. PLEASE KEEP ME POSTED. THANKS FOR AN HONEST RATING AND FOR USING FIX-YA. GOOD LUCK
If the choke has an adjustment point, then adjust the choke to a good overall working powerband. If it still doesn't act correctly, look for vacuum leaks. If it is an option, you may want to install a manually operated choke lever.
fuel filter or fuel pump problem or it could be the automatic choke is closed and choking motor make sure choke is plugged in on side of carb start car let it warm up with air breather off watch and see if choke opens up .also you can look down into carb when motoe running crack open throttle and see if it sprays gas into intake if it doesnt could be filter or pump. to check fuel pump remove fuel line from carb insert line into small can or bottle so fuel doesnt run ontop of motor and have someone just bump over starter and see if it pushes fuel out line with a descent amount of pressure check fuel filter.and if all that checks out try looking for vaccum line off to check get a can of either and squirt lightly around vaccum lines and listen for car to idle up if it does bad vaccum line. and also check distributer. but it sounds like it is getting to much gas so i would check choke first..... hope that helps .. and by the way you have a 351 modified 400 wich is 351 m 400.