The wrench I use for the fuel pump is simply one I have ground down, shortened, bent and otherwise mutilated so that I can turn one flat (sixth of a rotation) at a time.
I have a whole packet, perhaps 6 or so pages, or drawings, dimensions, Sears part #, etc, that I got from somebody about 1987 or 88. Some are hand drawn and some are typed and almost professional looking. I believe the packet came from the Stinson Club. The drawback is that other than the cylinder base wrenches they're not identified as to particular use. If you're interested, I can snail mail it to you. In addition I have about four 1/4" thin wall drive sockets that I've ground even more so they don't jam when working on certain intake and exhaust nuts.