First of all, welcome to the best darn petro site on the web.
As far as the speeders.... Just send them to me. I'll take care of them for you. LOL.
Some of those old tanks, just fill up with crud. Dirt, and rust, and what ever else gets in there. So, you just might want to disassemble the whole thing, to clean it out. I have, an old gravity fill tank here, and it works just fine. Of course, thats after replacing a few filters that were clogged because of all the crud that gets into those systems. If they aren't used continuosly,(sp?) they get ugly. A filter, shoulndt have much affect on the flow. And if it does, that just allows more time to enjoy living on an old farmstead.
I'm sure that Jack Sim, can provide a few answers for you about the old Tokheim.
And about that old GMC ton & a half.... I'll show you mine, if you show us yours....
BTW. Welcome to the madness....