My 91 d 350 has a minor fuel lead coming of the pump head, the pump looks rebuilt. Andi think it is coming from the bottom fuel line. It's just a steady drip. Could I have a cracked line possibly?

 

i found where the fuel leak is on my 91 ctd. its coming from the middle bolt on my pump head. i want to take it out to replace the o-rings on it but am afriad to becuase im not sure what is behind it (springs and what not) does anyone know what is behind this screw? here is a photo of a cutaway pump from a IP class i took a few months ago. i also have more pics of this cutaway pump if anyone would like to see them.