If the bike has sat for over a year, you’ll definitely want to drain the fuel and pull the pump.
Definitely sounds like the pump needs some attention.
I’ve NEVER heard the pump on my bike make a “gurgling” sound. Only sound mine makes is the typical high pitch whine when the pump primes.
Once you do remove the pump, and you address any issues related to the health of the pump, you’ll at least be able to rule that part out of your trouble shooting...