I don't want to step on any toes here but I still have a hankering that it is the pump. You replaced the regulator and still had nothing. The fuel pump keeps running because it can't build up enough pressure. Try the starting fluid again. If it hits just a little lick, then you have no problems except for fuel delivery. Don't go crazy with the ether either. It is not good for cars. I assume you already know this, but you need to spray ether while someone else is cranking.
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The sig says it all.
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