Good day to you all, i have just aquired a second hand fuel tank only this one has a small fixed pipe underneath at the front upper, and my old one ( 1990) doesnt, whats it for and can i blank it off if not needed?

Alright, just told also it could be the evaporative emission system vent line, which means this could be a Californian tank. So would it be alright to blank it off? never had one on my other European model.