I need a part for an evinrude 25hp outboard. It's an 1970 model. I am having difficulty finding the part. I have done an extensive search on the web and have not found it. The part is either a fuel filter or a fuel pump. I'm not sure which it is. The part number on the part is 312631 Is there a site I can go to and find this part that I may have not found on the web yet?? Please help. Thanks.