89 D50 2.0L - installing electronic fuel pump. fuel line routing help?

Hi. im installing an electronic fuel pump in my 89 ram 50. ( 4G63B ). im using the stock carb, and ive already removed the mechanical pump and installed a block plate in the head. i will be installing the pump near the tank, and if someone could help me figure out what to do with the 3 (4?) lines that come off the mechanical fuel pump.

i know one is in from the tank, the other goes to the carb, but there is a smaller line near the top of the diaphragm and a secondary line that goes to the carb. how is this connected?

any help is much appreciated

ok since nobody has spoken up, i spent all day trial and error'ing it. turns out its easy to mount the fuel pump near tank. for the lines that go to the mechanical pump, there are 3: one main feed, one return feed, and one vent type feed. on the carb, there are 2 fuel inputs, however the input that is vertical is the main fuel input. the other i assume is some sort of return.

also, lining up dizzys is a bittttch

did you ever figure out the lines

i rep[laced me mechinical pump too the 3rd line is a return if your charcol canister is still hooked up you have a venting method i just took a bolt and clamp to the 3rd line and zip tied it to the one of the existing lines