To pull tank, I think you have to pull the motor. It's under the motor.
It's not usually recommended to blow air into the fuel line because there is a valve at the other end. I think my old 863's had the same fuel system and my in-tank fuel pickup would get clogged and we'd replace it from the access under the machine's keel.
If you have a hole in tank, I'd think you'd see or smell diesel.