I push the primer about 10 times, then pull the cord a few times. Nothing. When I repeat (it's about 60 degrees here today), the mower runs strongly for only 1 or 2 seconds. Then I have to repeat all over again. It never runs more than 2 seconds, and seems to run longer with more priming.
I expect it's a clogged fuel supply somehow, even though the primer does get fuel to the engine.
Crafstman 15 yr old, self-propelled, 143.955500 engine
It ran out of gas the last time I used it, and now I have this problem. Maybe some particles of something got into somewhere. Same gas as before, not a new bad batch.
Air filter is not new at all, but I'd guess if it was bad, then the mower would never start. (I already took the mower to the basement to work on it away from the gnats, and it's partially disassembled - or else I'd remove the air filter anyway to see how it runs then.)
Thanks for any ideas.