Fuel tank install...

I have been running two 12 gallon Moeller fuel tanks and I just switch between them.... A friend of mine gave me a 25 gallon Moeller tank that went under the deck of an old bass boat.... After I move my batteries from the transom to the Bow I plan to make room for this single gas tank... Is there any reason that I can't hook it up with just a primer bulb like my smaller tanks are hooked up... I don't need a sending unit or any other electronic stuff because I can see that tank and it's not totally enclosed?... Any other advice would be appreciated thanks.