On May 5, 7:24*pm, George wrote:
On Tue, 05 May 2009 22:09:49 -0400, wrote:
On Tue, 05 May 2009 16:22:26 -0400, George
wrote:

I have a Stihl FS36 trimmer, which has a Walbro diaphram carb. *

It starts OK (after priming), but only runs for 10-15 secs before
rapidly losing power and dying. *After it dies, I can restart it (after
pumping the primer bulb), and it does the same again.

IMO, it acts like it's not getting gas. *There's no smell or other
evidence of it flooding. *But, (a) pumping the primer bulb while it's
dying doesn't seem to help; and (b) when I take the carb apart post
mortem, there's gas in the chamber under the diaphram. *Also, when I
operate the needle valve, gas flows up into that chamber. *So, the gas
seems to be there.

Any thoughts would be appreciated.

Thanks,
George

(NB: I have removed the spark suppresser screen.)

Jet plugged.

I wondered a little about that. *But, during its brief burst of life, it
seems to have full power, and good throttle response. *Would you still
think the jet?

the crab is fouled......usually from leaving gas in the unit

BTDT with a Husqvrana chain saw...exhibited the the same behavior.

not getting gas, runs that short spurt on gas "primed" in

clean the carb, it'll work

I learned this the hard way, paid to have the card "rebuilt"

cheers
Bob