On Sun, 20 Apr 2008 05:41:16 -0700 (PDT), Manjo
wrote:

On Apr 19, 11:00*am, dpb wrote:
Manjo wrote:
I have a leaf blower that uses a 5 hp B&S "L" head engine. *...
...
The leaf blower was starting to run poorly last fall. *This spring it
started right up, but after4-5 seconds after running smoothly at
proper speed, it will slowly loose rpms and finally stop after 15-20
seconds.

I have cleaned the pick-up tube, replaced the carburetor diaphragm
fuel pump along with the gaskets between the carb and the fuel tank,
and the gasket between the carb and the engine. *I've also
disconnected the engine ground wire that normally kills the engine
when the throttle is tuned full off. *But after doing all this the
engine still will not stay running for more than 30 - 40 seconds.

Thanks in advance for any tips, suggestions, or coments.

I've not read the rest of the thread but noted you were apparently still
searching --

Anybody suggested checking the exhaust screen (I'm assuming it has one)
for C deposits? *Sounds like it could be clogged w/ buildup which will
cause such symptoms...

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The exhaust has not been checked. I did put my hand near the exhaust
canister and I could feel puffs of air as the engine ran at normal
rpm. But now that you mention this, the air pressure felt a little
low or soft. I'll pull the can and check it today. Manjo

The crankcase has a breather also. See parts 8 & 9. This allows gases
to escape out the crankcase. They can be clogged, but cleaned easily.