You guys beat me to it....I was thinking all along there was a blockage in the system.....but I guess yeah...if you over fill the black , it does not matter how many traps you have....it's not intended to work that way...
Fir the record I have NEVER had a smell or issue with mine....alas , I never let the black get completely full either......
2015 F350 Platinum Fx4 6.7 Diesel Dually. B&W turnover, B&W Companion, air bags and wireless controller.
2015 Heartland Road Warrior 420 Rt
2012 f250 Fx4 6.7 Diesel crew cab tinted n tuned
2012 lacrosse 318bhs touring- sold