I just bought a 68 johnson 20hp, found that the plastic black piece on the side of the fuel pump is cracked, spraying fuel out when pumped to start. I also bought a 80's evinrude 7.5, the parts look indentical. Do you have to buy the entire fuel pump to replace the plastic piece? If so, where can I find one? Would the johnson and newer evinrude have identical universal fuel pumps? Thanks!