Husqvarna yth2148 isn't getting fuel to the

Sounds like there could be dirt in the fuel jet going into the carb. This will not let fuel into the engine. If that's not the problem the float could be stuck closed in the carb.

Larry,Carburetor may be dirty, remove and clean or rebuild. Check the attached links,videos,instruction and guides, Good luck
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http://www.mymowerparts.com/pdf/Husqvarna-Service-Repair-Manuals/W9200002.pdf

Could need a valve adjustment, old fuel could cause this, diesel fuel?

Go to www.jackssmallengineparts.com

Mowers aren't my forte but it sounds likt the valve clearances need checking. Here is a link to a description of how to correct the valve gaps.

Check there are no kinks in fuel line.
Make sure that the air filter isn't blocked.
Check the throttle cable is operating the throttle plate in the carburettor ok.
Ensure chain isn't too tight.
The carburettor should be a tight fit on the air inlet manifold.
It's possible that some of the jets could be blocked in the carburettor. You can try and clean these with compressed air but ensure you remove any seals gaskets, springs on the diaphragm pump , primer bulb etc as they can be damaged by the pressure.
You can also buy an aerosol can of starter fluid at your local autoparts store. This is sprayed into the carburettor to clear any partial blockages.

On my YTH2148 you take off the air cleaner and then the backing plate for the air cleaner and the carb is right there. If memory serves me there is a drain hole on the bottom of the carb, you can unscrew the drain bolt and the old gas is gone.

Check the fuel filter

Sounds like you need a new PTO switch.