I was removing my gas tank today, and man o man there are a lot of lines here. Can some one give a run down on the purpose of all of these?

Here is what I've learned so far from following what I could.

1-Filler Hose on bottom
2-Air vent to Fillter neck
3-Main fuel line to intake
4-smaller hose next to main fuel pickup - Vent from engine???
5-Three lines running off of top of tank...i think these lead to a vapor filter in the engine bay...why, huh? Why three to one?


Thank you for your time.