Ryobi leaf blower won't start

I have an old Ryobi leaf blower (Model # RY08554) that seemed to be losing power (i.e. not revving up as much as it used to) so I tried adjusting the carburetor. Unfortunately, that just made it worse, to the point when I got it started, it would only run for about 5 minutes before dying. I tried resetting the flow screws (1 & 3/4 turns from close on both the high and low needles) no help. After further adjustments, taking it apart and cleaning it, I gave up and purchased a new carburetor that came with a spark plug, fuel lines and fuel filter, which I used all of. Unfortunately that didn't make any difference at all. Even though I had fairly fresh gas, I went out and got some new gas, but again, it didn't help. I tried loosening the gas cap, didn't help. The only way I can get run for a second or two (proving that it is getting spark), is to spray some "engine starting fuel" down the carburetor. At this point I don't know what else to try.

I would appreciate any ideas on what to try next.

Thanks!

Also, I've found maybe 50% of the time, the aftermarket carbs just don't work like the OEM carb.
 
And, they require MUCH tuning...  As it sounds like your not getting fuel, open the high speed screw (closest to the air filter) CLOCKWISE TO RICHEN and get it fired up.
 
Once running, set the throttle to WIDE OPEN and adjust that screw (H.S.) for the highest RPMs.
 
Adjust the Low speed screw for a good idle and quick throttle response.  
 
Often, when you adjust one, it throws the other adjustment out so you'll likely have to bounce back and forth adjusting.   That is if the cylinder isn't leaking, muffler clear, etc..
 
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I've had them loosen in the past and blow out the lower gasket.
 
Make sure the gasket is good and re-assemble with LOTs of RED LOCTITE..
It's good up to, as I re-call 400F .