Im hoping this is a minor problem, but since im new to these things I have no idea what the part is called. I discovered I have a bad fuel leak today. It is gushing out of around a small white/yellowed plastic ribbed thing, right where the fuel filter and line go into. Is this the primer I keep reading about? what the heck is a hand pump? What a strange looking thing. Fuel is gushing out from the base of this plastic thing. Can anyone tell me whats going on here, what do I have to replace? The whole thing sticking out of the side of the block or just this plastic 3 inch thing? THANKS to anybody that replies!