I agree that the fuel pressure (39psi) is too high for fuel to boil in the pressurized lines. Since it has ran well for years, your fuel line are no too close to a heat source.
There is a check valve in the pump to keep the system pressurized when you shut it off. If you heard bubbling, it could have been the check valve leaking or the fuel pressure regulator leaking. It also could be that the pump was hot enough to boil gasoline, if so you are lucky you didn't let enough air in to support combustion, when you opened the cap.
I agree the pump is most likely your problem, but more importantly for safety reasons it must be checked first thing. I would make absolutely certain it is good before turning the key on again.
After changing my first fuel pump, I was stunned by the design. I work in process control for a chemical company. If we ever used technology like that around a liquid that was only half as volatile as gasoline, we would never get out of prison. The only thing I can figure is that they rely on the fact that there is not enough air in the tank to support combustion.