You probably have a clogged fuel line or fuel filter. I'm not sure what you're referring to when you say fuel filter regulator but I'm guessing you mean pressure regulator for the TBI. Tear down TBI and give it a good cleaning carefull not to scratch or gouge anything.
The regulator is in the engine computer not the alternator.
The power window regulator is defective. It is a plastic tape that can be easily replaced.
The voltage regulator is attached to the vehicles alternator. It can be replaced as a separate unit.
Yes
If it worked before the regulator was replaced, something was done incorrectly. If it didn't work before the regulator was replaced, the electric motor, switch or wiring may be at fault.
The regulator is in the engine computer, and if failed the computer will need replaced.
The voltage regulator for a Hyundai Tuscan is on the back of the alternator. It is bolted on and can be replaced separately.
The voltage regulator is part of the engine computer. That will have to be replaced by the dealer.
defective voltage regulator
If the window regulator cable has failed, the entire regulator will have to be replaced.
The regulator is part of the engine computer. The engine computer needs replaced.
The panel where the regulator is detachable. You will be able to remove it very easily. When you remove the panel you will see the way how the regulator can be replaced.