Question about Craftsman 21 Hp 42" Deck, Ys 4500 Lawn Tractor

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Lt 1000 quit running while mowing . found fuel filter clogged replaced finished mowing . did another lawn right after no problem next time i used it about a week later made one pass and died replaced fuel solenoid under carb rebuilt carb blew all fuel lines out cleaned tank . same problem exists runns for about 5-10 minutes or one pass on the lawn then dies ?

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Check the gas tank cap, there should be a small hole to let air in as the fuel is used. If it's blocked air cant get in and as fuel is used a partial vacuum forms in the tank, the fuel stops running and the motor dies.

Posted on Apr 10, 2014

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Sounds like you checked everything but the gas can.

Posted on Aug 23, 2011

  • ShedThoughts Apr 10, 2014

    Check the gas tank cap, should have a smal hole to let air in. If it's blocked air cant enter the tank to replace fuel as its used and you get a partial vacuum in the tank and the fuel stops flowing.

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2 Answers

Mower starts easily, but runs 10 seconds and quits.


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This is a basic lawn mower problem that haunts all the little gas engines in all makes and models of lawn mowing equipment....stalling and hard starting due to fuel problems stem most of the time from dirty, varnished fuel that has been left sitting inside your mowers fuel tank, fuel lines and carburator.
Also be certain the air filter gets replaced quite often they get dirty and clogged rather quickly, but back to your fuel system problems....lets address this in stages...first step is to drain and flush the fuel tank, the fuel lines, and the carburator(remove the carb. bowl).
Next step with a can of carb cleaner and a pair of eye protectors spray out the carb real good hitting all the small orifices(hol;es machined into the carb. body to transfer fuel or air) they have a habit of clogging up, also the small brass center fuel bowl you removed to drop the fuel bowl down for cleaning has a hole and a small vent valve in it do the same for it, next remove the carb. making a note of how the small linkage springs and rods go to meke installation easier when iot comes time to put it all back together, with the carb off, soak it in a mild degrease solution over nite, next day, gently blow out all the solvent from the carb being careful not to lose the needle and seat valve that controls the fuel/ float flow, when all finished reinstall the unit being sure the bowl fuel ring gasket is installed properly as not to cause a fuel leak, check after you get it running and all new fresh fuel is added , to see if the carb adjuster screw needs to be adjusted, it is facing the outside of the mower toward you and on the side of the carb around where the linkage is pivoting from.
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1 Answer

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1 Answer

See below


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