I rebuilt the carb (motocraft 2150 2bbl) on my 77 F150. Everything seems fine until I press on the accelerator. I get gas that comes up the two ports on top of the housing. This is the first time I've rebuilt one, so I'm not sure what is going on here. I've taken it apart 2 times since looking for some error that I've made, but I can't seem to find any. I've used new gaskets and all that. Should I use some silicone gasket sealer around the gasket also? Or have I lost a part that I'm not aware of. I'm not real sure what these ports do. They are hollow, but don't really seem to go anywhere. If anyone knows what I'm talking about, or what could be the problem, I could really use some help here. LOL I need to get this back together before tomarrow so I can get to work.