If it will not start, Beat on the bottom of the Gas Tank, with a 2x4, if it starts then, it needs a new Fuel Pump.
A 2001 Chevy Blazer does not have a carb. It is fuel injected and has a throttlebody. If the fuses and relays check okay and the fuel filter has been replaced, I would suspect the fuel pump has failed.
Dose the 2001 chevy blazer 4x4 4 door have a access panel to the fuel pump
Probably the fuel pump is bad.
In the fuel tank
unfortunately, it's located inside the fuel tank
Chevrolet does not have reset switches.
check ground first
Fuel pressure test.
On top of the fuel tank.
Check under vehicle follow the fuel line from tank
under the intake plenum behind and attached to the spider
The engine will develop a skip and the check engine light will illuminate. The code set in the ecm will direct you to which injector is bad.