doin the pump swap is very easy, but when i put the new 155 lph pump in i had to use a hack saw to cut like 3/4in of the metal pipe off and put in a new rubber hose, cuz the pump was longer then the stock. after the wires are unplugged and the filler neck loosed and the tanks on the ground just get like a flat head and a hammer to loosen the screw like ring and the sending unit and pump will have to be twisted and turned in a few directions to get it completaly out. very easy.