2008 Tacoma Possible Fuel Pump

So recently ive had some p101 codes pop up with my check engine light. I replaced the maf sensor and the light turned off. All was good for about a month, then the light recently returned. This time the light turned off on its own and about 2 days later it turned back on. Then im driving 1 morning, 5 minutes into my trip, my truck stalls. Now it will not start. It cranks, but doesnt wanna turn over.. I changed the maf sensor again, just to make sure that wasnt the cause, and still nothing. I checked the fuel pump relay, no luck.. Im thinking its the actual fuel pump.. Should i be able to hear the pump when the key is turned on, or does it only activate when you try and start the truck? Cause i hear nothing when i turn the key on, but seems like the pump activates when the key tries to actually start the truck. I can hear a buzzing sound for a second or 2 after i let go of the key.