Ennis was 6 of 12 from the field. King also had a team-high seven assists.
Deng Deng scored 15 points, and Mike Caffey had 14 for the 49ers (10-8, 6-1 Big West).
Long Beach State led 36-30 at halftime in a game with 16 lead changes. The 49ers shot 47 percent from the field for the game, while the Titans shot 39 percent. The 49ers outrebounded the Titans 51-31.
Sammy Yeager led Cal State Fullerton with 22 points. D. J. Seeley had 17 points and a team-high nine rebounds. Deuce Johnson added 10 points. Kwame Vaughan had seven assists for the Titans (10-8, 3-3).
The 49ers lead the all-time series with the Titans 61-43.