Honestly, I made that bad pre-flop call because I was tilting. But the question is about post flop play. I think I overplayed flash draw. On flop I called that big raise, because theoretically I have implied odds, especialy against two players, right? Now, on turn both players pushed, and I get ~3:1 pot odds, with my flash draw+gutshot I can call, right? But still I have feeling that I overplayed it 
Hand converted with online PokerStrategy.com hand converter:
$0.02/$0.04 No-Limit Hold'em (9 handed)
Known players:
[tg]UTG1$0.21:///////;UTG2$2.39:///////;MP1$4.21:///////;MP2$1.36:///////;MP3 (Hero)$4.04:///////;CO$3.74:///////;BU$4.86:///////;SB$4.02:///////;BB$1.20:///////;[/tg]
Preflop: Hero is MP3 with 7:s, K:s.
UTG1 folds, UTG2 calls $0.04, MP1 folds, MP2 raises to $0.12, Hero calls $0.12, CO calls $0.12, BU calls $0.12, SB folds, BB calls $0.08, UTG2 calls $0.08.
Flop: ($0.74) 3:s, J:s, 9:h (6 players)
BB checks, UTG2 checks, MP2 bets $0.12, Hero calls $0.12, CO folds, BU raises to $1.19, BB folds, UTG2 calls $1.19, MP2 folds, Hero calls $1.07.
Turn: ($4.43) 8:c (3 players)
UTG2 checks, Hero checks, BU raises to $3.55, UTG2 calls $1.08(All-In), Hero calls $2.73.
River: ($11.79) 8:h (3 players)
Final Pot: $11.79.
Results follow:
Hero shows a pair of eights(7:s K:s).
BU shows a full-house, nines full of eights(9:c 9:s).
UTG2 shows a full-house, threes full of eights(3:d 3:h).
BU wins with a full-house, nines full of eights(9:c 9:s).
Especially when you are going to make such mistakes on the turn. Pretty bad play. 
cards left) / 46 (the number of cards we haven't seen in this hand yet) = 0,1956521739130435 => you hit your flush 1 out of 5 times on average if you go allin on turn with a flushdraw.
But my calculation error, I thought that I have odds 2:1 on turn, while actually they were 3:1. 
I see mistake now.