i have a 1979 f150 ranchero 5.0 8cyl. i have a gas leak on the carb. every time i press on the gas it spits gas out of this small hole. i dont know if its a breath hole or if its supposed to be plugged. any one know why it leaks. thanks any help is appreciated.

 

it has a motorcraft carb

 

I had a similar issue with my 1977 f150 carb. I replaced the accelerator pump and it fixed the problem. Just realize if you remove the 4 screws to replace it, all of the fuel will pour out of the fuel bowl. Its about 4oz of fuel. should be a simple fix. Just by a carb rebuild kit for your model carb and you will get everything you need. Hope this helps.

 

Thanks. Yeah I replaced the accelerator diaphragm. $4 later and it solved the problem.