I'd suggest to pull the plug out and brush electrodes...clean off the carbon and what not.

Is this the type of blower/vac that you need to mix gas/oil and is it properly proportioned?

While I never had a gas powered one, my brother swears by them.
He used to swear at them as well, until he discovered a screen somewhere on the exhaust port that would eventually become clogged with unburned oil and grime. Cleaning that solved the bulk of his problems, check that as well.

As pointed out in past forums, two stroke motors are very sensitive to exhaust systems. When they get plugged, and they will, they don't run well when they can be started. You can't get fuel in if you can't get the exhaust out. Take the exhaust apart and clean it well.

My brother was just telling me that he had a weed-eater do a similar thing. He ended up pulling the foot-valve out of the fuel tank and it had sucked a bit of dirt up around the little ball in the valve. He shook it out, re-installed the valve and hose, and it's worked great since.
Maybe your problem is similar? Just one more thought.


eeyore

Clean the carbon build up off the screen on the spark arrestor and the muffler. I had this same problem with my Craftsman leaf blower/ vacuum.

Posted By rtringale1 on 09-08-2010 11:31 AM

Hay yall , I got a craftsman leaf blower vac that when i ran it out of gas and will not restart at all. Please can anyone help me on this one. Thanks

I agree with most of the suggestions on "CLEANING THE MUFFLER/SPARK ARRESTOR FIRST" since it is probably needed anyway.  But, I want to also cover another area that is often a problem with equipment stored for extended periods, especially for those long 6 month long northern winters.  This is FUEL STORAGE.... fuel will GO STALE (loose its 'efficiency') when stored for longer than TWO MONTHS.  Did you leave fuel in the blower fuel tank or drain it out for storage?  Was the fuel can also stored over the winter too?  Did you start the 'new season' with a fuel container of FRESH FUEL MIX?  If not, then that may also affect the ability too start the equipment when the new seasonal use time comes again.

If cleaning the exhaust/muffler system doesn't correct the starting/run problem, then consider the below listed issues.  Start with using a small 'hook' fabricated from an old wire coat hanger to remove the 'weighted fuel filter assy on the end of the fuel pick-up fuel line from the fuel tank for inspection (and possible replacement if damaged).  On mine, the ethanol had turned the foam fuel filter assy into a 'gel-like mass' which blocked all fuel flow to the carburetor.

ETHANOL FUEL:
If you used FUEL THAT CONTAINS ETHANOL in your 2-stroke mixture, IT HAS A TENDENCY TO 'SEPARATE' from both the gasoline and oil mixture when stored for longer than 1-2 months in a container or fuel tank.  This not only can cause issues with the 'fuel burn' characteristics, but also can lead to 'contaminated fuel' since the ethanol (alcohol based) will readily absorb water from any condensation that accumulates in the tank/storage container over cool weather conditions.  Ethanol can also affect many rubber/plastic/foam based components used in many fuel systems.  The ethanol can harden plastic fuel lines which can lead to them easily breaking and cracking; harden the 'diaphragm' assy used in many small engine (yard equipment) carburetors, which function similar to a 'fuel pump' to transfer fuel from the fuel tank to the carburetor; and can also turn the weighted fuel filter (often a plastic/foam assy) into a gel-like mass (used in most weed-eaters and blowers and chain saw fuel tanks).  

For more info on 'ethanol-based' gasoline fuels becoming mandated by many states and local areas, browse some of the previous discussions on this and follow the 'links' provided for more informative info sources and articles.  These ethanol type fuels can be a REAL PITA when used in some 'non-compatible' fuel systems (especially small engine yard equipment) and are not as 'efficient' nor 'green' as some of our government based literature would have you believe. 
IMHO