Failure to install grub

I have a disk partitioned as gpt. I have an existing boot partition to me mounted as /boot/efi. I manually partition Netrunner and select my fat32 partition to be mounted as /boot/efi. I select another partition for root. When the installation completes there are no errors. When I reboot my grub from a distribution on another partition boots. Netrunner never installed its own grub. Ideas and comments are greatly appreciated.