Self-exchange petrol pump V70 (Bj 97)

Hello municipality, since the Volvo dealer for gasoline pumps wanted to swap 900€ (pump about 500€), a buddy and I now want to exchange the gasoline pume (Boschservice 180€ ) themselves. Volvo V70 / Built 97 / Petroler / 106 KW Does anyone have any instructions / tips about this ??? or possibly so n hobby book and could scan and mail me the corresponding ????? Thank you for your help in advance Badener74