tank and/or causing it not to allow air flow in some way back to the gas tank. It's a closed system, so if as fuel is being drawn out of the tank there's no way for air to get into the tank to displace the fuel....you'll end up with tank vacuum. The car will stall out since the fuel pump won't be able to deliver due to the gas tank vacuum.
Generally for cars with OBDII systems there are more controls on fuel tank vapor than the earlier OBDI Configurations - so worth studying your Z's specific configuration to make sure anything being eliminated doesn't lead to other running issues. Just my two cents...