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Q:

fuel pump on 2005 Ford Thunderbird

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
yes replaced the fuel pump 3 times still loss of power...what could it be?
(1) Answer
You'll need to troubleshoot the issue, see what is happening when it is losing power. Is it losing fuel pressure? Fuel volume? Is the exhaust restricted? Do you have any diagnostic trouble codes stored in the engine control module? Is the transmission OK?
There's so much info missing here it's hard to know where to go from here except to say, don't replace the fuel pump again and try to diagnose the problem before replacing any other parts.