there are 3 places for lines to exit mine only had 2 used could someone tell me what each is hooked up to cause my car doesn't get fuel and gas gauge does not work, not sure which goes where

 

i believe its only got a mechanical fuel pump at the motor i inspected it seems ok but the tank leaks out of the unused hole so i'm thinking because its so old could be a pressure issue since it only uses about 5 psi to run the car

 

i fixed the no gas to carb problem but \gas gauge doesnt work and one of the outlets on the tank is unused, secondly car wont start i filled the carb with gas it ran till that dried but wont take gas through the needle and fill up the float:S