Help please

:banghead: Hi there, Im really hoping someone can help.Ive bought my son a Diesel Nissan Bluebird LD20 MK11, 1988, to hack around in. The cars in great nick but is leaking from the fuel pump, the petrol companys have bought in low sulpher diesel that melting the o rings. Can anyone tell me any ways to fix this and has anyone any diagrams on how to pull the pump apart instead of paying mega bucks to a garage.:screwy:

Cheers