First, you have to recognize there are NO mechanics, zip, nada, zilch, none that can work on carbs properly! Unless they are at least 65-yrs old; they simply do not have experience and training for this. STOP looking for mechanics to solve your problems, they will only make it worse. YOU must be one to learn and fix this bike. If you don't want to do that, then sell it and buy running bike with EFI. Will save you tonnes of time and money in long run.
A) drain for leaks from fuel-level sender. Snake hose down past shock and aim open end to ground
D) starter power cable. Other end should connect to M terminal of starter solenoid
Use these to reconnect carb-hoses properly
One way to determine where things go is from parts diagrams
https://www.bikebandit.com/oem-parts...8915#sch550359
And manual:
Vacuum-T on between vacuum port and coast enricher connects to PAIR valve above cylinder head.
You probably don't have CA EVAP system with 3-port tank. Single vent port on tank should have hose that goes down left side of bike and exits down by rear shock.