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Mount the pump in rubber, if it already is, try a different pump. I've done serveral TBI conversions and have only had one that I could hear the pump power up at start up.
I swapped it for a new one and it was quiet.
Make sure the pump is mounted to the frame and not the tub, the thinner metal on the tub resonates the sound.
Butch
 

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I went through 3 different aftermarket pumps on my pickup before I finally bought a new one from Toyota. They all made the squeeling noise while running. SO I recommend from Toy or one from like summit or other style racing pump. The 3 pumps I had were from Napa, Autozone and Kragens.
 
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