Yep, that clear hose is the VST drain. If look down at the base where it hooks into the VST, there is a small set screw. To drain the VST, you open that set screw and hold a clear 1 quart jar under the end of the hose. It's best to briefly activate your HP fuel pump just before doing that in order to pressurize the VST.
How do you know you have a fuel leak?
A very likely place for a leak to occur is the O ring on top of the high pressure fuel filter. It's hiding behind a vacuum diaphragm on the back of your engine, just below where the bottom of the engine cover sits. Shine a light in there and have someone turn on the key switch to activate the HP fuel pump and see if there is any leakage behind that diaphragm. If so, you need to remove the two Philips-head screws holding the diaphragm in place, set it aside, then remove the three screws holding the cover to the HP fuel filter. There is a flimsy O ring that seals the cover to the filter body. If you are replacing the O ring, do yourself a favor and replace the filter while you are at it. A new O ring comes with the filter.
Other likely places and the fuel hose connections to the on-board fuel/water separator and low pressure fuel filter on the starboard side of your engine. Another possibility are the hose connections to the low pressure fuel pump. Follow the hose coming from the low pressure fuel filter. The next junction is the low pressure fuel pump on the opposite side of the engine.
After that, it can get a little complicated.
The link below shows you all of the fuel line connections.
http://www.boats.net/parts/search/Honda/Outboard Engine/2004/BF225A4 XA/PIPING/parts.html