Thirteen minutes into the game, PNG flanker Micheal Foster found an opening to belt a powerful right footy into the goal to lead 1-0.
Samoans fought hard to cross into the PNG territory but faced a strong Komolong-brother combination that held them off the half-way line.
Raymond Gunemba then bagged the second goal for PNG in the 32nd minute with a stunning dribble in front of the goal mouth, avoiding the Samoan opponents before slotting it behind the net for 2-nil.
PNG Kapuls need more goals to be on the safe side to qualify as the next match between Tahiti and New Zealand will determine their fate in average goals scored.