This is an easy fix,tools required flat blade screwdriver,7mm ring spanner,fine point soldering iron & solder.
Remove fuel pump,mark outer housings with felt tip pin so can all be aligned on assembly,remove all screws,dismantle housings,
remove circlip from lower end of armature,take note of thrust washer and shims,
remove two 7mm nuts and remove armature housing,unsolder where coil wires are soldered onto brush holder,pull out both brown
and red terminals from housing after removing central screw.Now you will see the two O rings required as well as the rest, any shop
that sells Viton O rings will be able to match them up for you,Viton is petrol resistant.
Replace all the Orings resolder the coil wire connections, apply a small amount of vaseline to all the O rings on assembly.
First time around should take 2 hours max.and cost about $20--$30 for Viton O rings.