Lead Technician reported conflicting instructions from supervisors led to a fuel leak requiring additional time to resolve; causing a delay in returning the aircraft to service.

Narrative

Supervisor NAME assigned me to have my crew refuel Aircraft X. After refueling to 12;000 pounds; (6;000 pounds in each wing); a fuel leak developed in the area of the L1 outboard engine feed pump fairing. I instructed my crew of mechanics to transfer all fuel to the right wing immediately. Supervisor NAME1; who was not in charge of the aircraft; told mechanic NAME2 to wait to open the right wing fuel valves and instructed mechanic NAME3 tighten the bolts which hold the cover plate on. I knew that this was ill advised and would not stop the running fuel leak. I immediately went up to the cockpit and initiated the fuel transfer procedure; while instructing mechanic Told NAME3 to open the right wing refuel valves and transfer switch at the fuel panel. After all fuel was transferred to the right wing; I shut off electrical power and instructed the mechanics to sump the fuel tank per the AMM (Aircraft Maintenance Manual); which also references the proper safety procedures. The supervisor attempted to circumvent the Crew Chief by leading and directing mechanics and stopping the transfer of fuel from the leaking tank. Supervisor NAME1 should be aware the proper fueling safety precautions to avoid placing mechanics in a dangerous situation; let alone risking damage to the aircraft should a fire occur. Supervisor NAME1 should not intervene in areas of which he has inadequate knowledge and experience. Supervisor NAME1 should not lead and direct mechanics-that is the job of the Crew Chief.