Should my fuel pump run all the time on my 1990 ford f150 5.0?

My fuel pump runs all the time when running I don't think it should be when I'm at about 45 mph it's hard to get up to speed and it sputters like it's getting to much gas or not enough I've tried everything could someone please help me why does it sputter like it's running out of gas but is not is this bc the fuel pump shouldn't run all the time continuously

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