How to replace vacuum line on total 50 scooter

Question edited for clarity.

Help and the Service Manual

https://www.google.com/search?q=2002+hyosung+sense+gas+and+vacuum+line+diagram

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Sorry I dont have a such information but however I can suggest a few general steps to take to troubleshoot and repair the issue.

1. Check for spark: Remove the spark plug and connect it to the spark plug wire. Hold the plug against a metal surface on the engine and try starting the scooter. If you see a spark, the ignition system is working properly. If there is no spark, you may need to replace the spark plug or check the ignition system for problems.
2. Check fuel and vacuum lines: Inspect the fuel and vacuum lines for any signs of damage, cracks, or leaks. Make sure they are properly connected and free from any obstructions or blockages.
3. Check the carburetor: The carburetor is responsible for mixing fuel and air to provide the engine with the proper fuel-to-air ratio. If the carburetor is dirty or clogged, it can cause a loss of power or difficulty starting. Clean or replace the carburetor if necessary.
4. Check the fuel filter: A clogged fuel filter can restrict fuel flow and cause a loss of power or difficulty starting. Check the fuel filter and replace it if necessary.
5. Check the fuel pump: If your scooter has a fuel pump, check it for proper operation. Make sure it is receiving power and is pumping fuel to the carburetor.

If you're unable to diagnose and fix the issue on your own, it may be best to take your scooter to a qualified mechanic or dealership for a proper diagnosis and repair.

Question edited for clarity.
Question moved to sub category.

Check out the link. Also click the images tab.

https://www.google.com/search?q=2003+ford+f1-50+4x4+4.6+vacuum+line+schematics

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Silly question, but are you sure you are getting gas through the line? Could the line from the tank be plugged? How about the tank port?
Is there a fuel shutoff?

The vacuum port is near the mounting flange, sticking out horizonally near the top on the right side just above the fuel inlet. This vacuum is used for the fuel pump or the fuel shutoff valve, otherwise it is plugged off.