nl25 turn flush-unraised pot

Can I ever fold here?

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.1/$0.25 No-Limit Hold'em (8 handed)
Known players:
[tg]BB$17.35:///////;UTG2$29.02:///////;MP1$49.87:///////;MP2$6.62:///////;MP3$9.47:///////;CO$18.07:///////;BU$30.57:///////;SB (Hero)$32.79:///////;[/tg]
Preflop: Hero is SB with 8:s, 9:s.
UTG2 folds, MP1 calls $0.25, MP2 folds, MP3 calls $0.25, CO calls $0.25, BU folds, Hero calls $0.15, BB checks.

Flop: ($1.25) 4:s, 8:c, 6:s (5 players)
Hero bets $0.83, BB folds, MP1 folds, MP3 calls $0.83, CO calls $0.83.

Turn: ($3.74) T:s (3 players)
Hero bets $2.49, MP3 raises to $8.39(All-In), CO folds, Hero calls $5.90.

River: ($20.52) J:h (2 players)

Final Pot: $20.52.