No problems I think??

[roboto65]

I was filling up with gas the other day and well I have never noticed or somethingis loose although it did not move when I spewed gas in the tank 

Anyway there is what looks to be a copper tube running from one side to the other on the floor of the tank right in front of the fill hole towards the front  does anyone have an idea what this is I know there is a vent tube in the tank but have never seen the inside of a tank. might someone have a cutaway view??

[junior]

its your vent tube it is the one that your vent hose hooks to behinde your petcock

[SCain]

I believe it the fuel gauge sending unit.