Craftsman riding mower, B&S 18hp Intek. No fuel pump. ABout 11 years old. I bought it new and it has given me zero problems up to now. Well-maintained throughout its life. While mowing a few days ago, it just sputtered and died. Would restart and sputter for a few seconds and die. At that time, I pulled the gas line off the carb and gas was flowing. Hooked it back up and it started, ran a couple minutes, die. Would restart and sputter. Then would restart and run a minute or two. Then restart and sputter. etc. It seemed if I removed the gas line and then hooked it back up that it would run longer. But maybe one time out of ten. Removed the carb and sprayed it all out and reinstalled. Changed the air filter and fuel filter. SAme results as before. Gave up and read some forums.
Each morning, I would go out and start it. it would run 2-5 minutes, then sputter & die. Then restart & sputter & die. I tried this both with the gas cap on and gas cap off. Also with the gas cap partially on. No difference. If it sat overnight, it would do the same thing the next morning. STart, run 2-5 minutes, restart, sputter, die, restart, sputter, die. Gave up and read some more forums.
So this morning, I took the carb back off, cleaned out every orifice with a small wire, Sprayed carb cleaner in every orifice. Even sprayed WD-40 in them (because it had a thin tube so I could get more pressure) then followed up with more carb cleaner. Got good spray out the other side of the holes, cleaned and sprayed the carb inside and out within an inch of its life. ABout a half of a can of carb cleaner used. Checked the solenoid on the bottom of the carb bowl. It activates when the key is turned on. Put carb back on and......no change from previous days, other than it now would have to sit a shorter amount of time in order to restart - hour or so vs. overnight. Ugh. Replaced the spark plug. And now its getting a little better. (old plug was light brown & looked fine, but I replaced anyway) It will now start, run for 2-5 minutes, sputter & die, restart immediately, run 2-5 minutes, sputter & die, repeat. I repeated this cycle five times. One time with gas cap on, one time off, one time with the idle mixture adjustment screw turned to the left, one time with it turned to the right (there is a limiter so it will only turn 1/2 turn in either direction), then one more time with it in the middle. No change. It always starts right back up immediately now after sputtering & dying. Sometimes if I pump the speed control from "mow" to "choke", I can coax it to run sputteringly 15-30 seconds longer. Gas level at any time in the clear fuel filter is about 1/3 whether sitting, running, or having recently died.
This is making me nuts. Help!
Each morning, I would go out and start it. it would run 2-5 minutes, then sputter & die. Then restart & sputter & die. I tried this both with the gas cap on and gas cap off. Also with the gas cap partially on. No difference. If it sat overnight, it would do the same thing the next morning. STart, run 2-5 minutes, restart, sputter, die, restart, sputter, die. Gave up and read some more forums.
So this morning, I took the carb back off, cleaned out every orifice with a small wire, Sprayed carb cleaner in every orifice. Even sprayed WD-40 in them (because it had a thin tube so I could get more pressure) then followed up with more carb cleaner. Got good spray out the other side of the holes, cleaned and sprayed the carb inside and out within an inch of its life. ABout a half of a can of carb cleaner used. Checked the solenoid on the bottom of the carb bowl. It activates when the key is turned on. Put carb back on and......no change from previous days, other than it now would have to sit a shorter amount of time in order to restart - hour or so vs. overnight. Ugh. Replaced the spark plug. And now its getting a little better. (old plug was light brown & looked fine, but I replaced anyway) It will now start, run for 2-5 minutes, sputter & die, restart immediately, run 2-5 minutes, sputter & die, repeat. I repeated this cycle five times. One time with gas cap on, one time off, one time with the idle mixture adjustment screw turned to the left, one time with it turned to the right (there is a limiter so it will only turn 1/2 turn in either direction), then one more time with it in the middle. No change. It always starts right back up immediately now after sputtering & dying. Sometimes if I pump the speed control from "mow" to "choke", I can coax it to run sputteringly 15-30 seconds longer. Gas level at any time in the clear fuel filter is about 1/3 whether sitting, running, or having recently died.
This is making me nuts. Help!
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