Briggs opposed twin fuel question.

I'm in the process of swapping in an opposed twin Briggs into my zero turn after the single cylinder Briggs let go. Anyway I'm having issues with no fuel when trying to start. The old intek has a vacuum line going into the oil dipstick tube and the twin does not. I'm pretty certain that's causing my issue. No fuel is moving through the fuel lines at all. My question is what can i do to remedy this? Can I drill and tap the twins dipstick tube and install a barb to fix the line to?

Thanks for any insight. I tried to insert pictures into the post but it doesn't seem to be working.

you have a fuel pump on the front of the carburetor I see a fuel pump in the first picture. Another thing is the charging system may not be enough for electric PTO check it out also

Was the twin working before you installed it ?
If it has been sitting foe a while it will need a full carb strip & clean.
It is a complicated carb so for starters go to B & S customer service section and download the parts book for that engine, you will need the model & code numbers.
There are a lot of EWE tube videos on stripping & rebuilding H twin carbs because people have trouble with them .
They are easily damaged so watch the videos before you pull it apart.