Fiji conquered the entertaining match after scoring seven tries with four in the first half and three in the second spell.
Centre Tevita Sabola scored a double while the other tries were scored by Sireli Masiwini, John Muller, Seremaia Komailevuka and Jonathan Sovasova.
Samoa won their first game 69-7 against Tonga A.
They will meet Junior Japan in their next game while the Warriors will play Tonga A on Saturday.