30 & 87 are from HOT/BAT to PUMP
85 & 86 are the switch. One side to IGN, the other to GROUND/EARTH (or better yet, to Ground through an inertia switch.
87A leave unconnected.
Make sure you put a FUSE on the BAT wire, otherwise a short anywhere in the rest of the circuit will burn up the wiring and potentially cause a fire.
Like this:

or better yet:
http://datsun1200.com/modules/mediawi ... Electric_Fuel_Pump#Wiring