I'm not sure what plastic plate you are referring to.The third hole was actually sealled till i made a puncture to it.No stopper. i have for the time being ealed it off with the epoxy but as i said it aint good enough.Maybe will try silicon or the easier method which i have heard so far is remove the epoxy(which i hope is not too tough to remove!!) and connect a fuel tube over it and plug it up with a stopper.
Plz flood in with any other better suggestion.
Cheers.