Little or no fuel pressure.
If the relay is bad, then the fuel pump will not work.
bad fuel pump bad fuel pump
Bad fuel pump, blown fuel pump fuse, bad fuel pump relay, or clogged filter.
Although vapor lock is very uncommon in fuel injected engines, you may have all of the same syptoms. When fuel temperature in the tank rises, the operating temperature of the fuel pump also increases. If your fuel pump is old, or weak it could be working intermittently, causing the same syptoms as vapor lock, but I find just as often these same syptoms are caused by weak ignition components. Very simple to diagnose, when it happens ( not after it cools down ), check for spark at the plug while a helper cranks the engine. I have talked to people that have spent hundreds on every other possible part, just to find out they have a bad $15 coil that acts up when it gets hot !
If your fuel pump is not running , it could also be the fuse for the fuel pump relay , the fuel pump relay , a bad electrical connection , or a bad fuel pump
A few possibilities could be the fuel pump relay is bad, the fuel pressure regulator is bad, the fuel pump circuit wiring may be bad and maybe the new pump is bad.
Fuel pump inertia switch tripped , fuse blown for electric fuel pump , bad fuel pump relay , bad wiring connection
Bypass the relay and if the pump works the relay is bad.
Being a GM, one reason could be a bad fuel pump, another reason could be a bad fuel pump and then again it could be a bad fuel pump. I would check the fuel pump.
A fuel pump pressure test could determine the condition of the fuel pump and fuel system.
The best thing to do is replace the fuel filter anyway. You will need to do it even if the fuel pump is bad, so you have nothing to lose. You can listen to hear iif the fuel pump is kicking on at all. If it is, just do the fuel filter. Its much cheaper and easier than the fuel pump. Then you can test the fuel pressure to see if the pump is bad after you replace the filter.
Bad fuel Pump? Bad fuel pump relay? Plugged fuel filter?