It isn't a pump, it is a solenoid valve, 2 IN and 1 OUT, 12volts on selects one hose, 12volts off selects the other hose.
universal version pictured here
Universal Fuel Tank Switch Over Valve for Dual Tanks 12 Volt EZ to Wire | eBay
So both tank's hoses are hooked up to this valve then fuel line to engine is hooked up
There will be a switch on the dash that either sends 12volts to the valve or doesn't, with key on only, not 12volts 24/7, that will run down your battery
These dash board switches usually have the fuel gauge sending unit wires from each tank passing thru them so gauge changes when tank is switched