Hi Bro...
Firstly, how much EO do yu expect 2b collected?
In my case, only abt 3-4 ml was collected in that "fuel filter OCT" over abt 5Km use...mostly city/town driving...
Secondly...To which "outlet" did yu connect tube to the OCT?
Facing the car, it shld b the LHS outlet tube @Rocker Cover... ie inbetween PCV tube to inlet manifold...
NB. Officially..that's the RHS... Haha!
IINM the other tube is supposedly for air intake juz b4 throttle body to provide clean filtered air into Rocker Cover...
However if yu do alot of hi thottle openings (hi revving), then there's possibility of EO fumes being sucked by greater vacuum @ that "air intake" tubing...

To prevent that, yu can use a small sp air filter (PCV filter) unit 2connect as an Independent air intake filter.
Then it wld not b affected by yr throttle openings...

i expect it to be a bit more, but it does it job, like a few drips been captured. yep i connect it between the intake hose and the rocker cover (the right part facing the engine), another one at the rocker cover to the...bottom of the intake manifold i guess (the left part)?