Help! switched single to dual carbs

Anyone know? I have a 89 sea doo 580 I rebuilt from the ground up, don't ask why, I just did it. Anyway, I put a dual carb on it where it used to have a single. I replaced the cables etc. and I'm just about finished. The problem is that I have a stock fuel pump for the old single carb that connects it's vacuum line to the crankcase, the dual carbs also have a vacuum line that supposed to connect at the same place. Anyone know what to do? Can I block off the carbs vacuum line and use my old fuel pump?