Okay, I dug out my manual this morning. Remove the rear bolt. Loosen the other bolt and using a 3/8 rachet with short extension roate the bracket. Slide the tank FORWARD. I place a towel in front of the tank before sliding forward to protect it if it gets away from you. Also, the rubber bushings on the bracket will come off so take note of the orientation so you can replace them if needed. The tips are bevelled asymetrically.
Don't forget about that cross-over tube...