Ok, so I know the lower hose is the heater hose... it even has a prestone cap to simplify identification. Also the hose connected to the VSV I bypassed once I began having a need for heat. Sooo... what's in the black plastic? It's a metal hose of some sort and also comes out of the firewall... is this my fuel line? And if it is the fuel line, how bad is it if the fuel in the line is being heated up before it gets to the intake manifold?