Main, not center. Is this poster referring to the main fuel pump? If so, why the main and not the centre?
Center fuel pumps only if we have more than 2300kg of fuel in the center tank (NG) or more than 453kg (classics) and if they are on we have to have personnel on the flightdeck at all times to check for low pressure lights. Since we usually don't have to tank that much we don't do that very often.