Fulse kick-started the Seahawks (3-6, 1-4 Northeast Conference), who had lost three straight, with a 65-yard touchdown run on their first possession.
James Cooper added field goals of 36 and 39 yards in the first quarter, the first one set up by a fumble forced by Cameron Gill that Maurice Diawara recovered on the Colonials' 27. Massei connected with John Williams for a 47-yard score a minute before halftime and with Chris Woodward for 23 yards in the third quarter.
Allaah Sessions had 2 1/2 sacks for the Seahawks, who finished with six and held Robert Morris to 210 yards of offense and two turnovers.
Marthew Barr hit Dalton Elliott for a 1-yard TD late in the game for the Colonials (2-7, 0-4), who have lost six straight.
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AD Bjork leaves Ole Miss for Texas A&M job
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