I agree with tester on both points.
I’m unable to access a '95 Santa Fe diagram, but it sure looks to me like the disconnected “tube” is part of the induction system, and if it’s aft of the mass airflow sensor the ECU will not know there’s air passing through the induction system (that leak is big enough to supply the cylinders all by itself) and the engine won’t run. Reconnect it and post back.
Re: the “missing fuse” in the underhood fuse box, that may or may not mean something. I see three, the one you’re pointing at, one in the “field of blue boxes”, and another empty well next to the diode (the thing with the white arrow). But this is very common. Fuseboxes are made to accommodate various options that you may not have, design changes as the model evolves can leave empty wells, and they can even be used for different models, and that can leave unused holes. There’s really no way of knowing without more detailed technical information about the specific vehicle. Since it ran before, I’m inclined to think that one is intentionally left empty.
A competent shop can access the information to check these things out. He can also do things like test for fuel availability and spark availability. And battery strength.
This might suggest that the pump has been slowly dying and has finally met its end. Be sure you tell the mechanic at the shop everything you can, and let him find out why. Bring notes if you feel it’ll help you.