1978 Ford e150. Standing in front of the engine compartment looking at
the carb. behind the dist. One connection, lower right is the fuel line
connection. Slightly up and to the left is another similar looking
connection. Questions: What is it & where/what does it connect to?

Haynes, Chilton left me still scratching my head. I'm a very minor
league shade tree mechanic and after some work can't remember/figure
this out.

Thanks in advance for any help. Ken