Why wont my z150 snapper start
It sounds very much like the carburetor's float valve is stuck shut, not allowing gasoline to enter the carburetor. Try tapping on the side of the carburetor several times with a screwdriver handle while a helper cranks the engine.
It's also possible that the choke isn't closing for a cold start, or that someone has fiddled with your idle mix screw, turning it fully closed. If you're SURE that nobody has tampered with the idle mix screw, it may be time to pull the carburetor off for a thorough internal cleaning & possibly a rebuild kit.
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