Most likely the threads in the carb are 1/8" NPT. That will actually measure around 5/16", as the size roughly refers to the ID of the fitting. Finding one with a screen tough will have to come from a carb shop or the dealer.
The orings you added to the other fitting, probably not going to work. Keep looking until you find the right fitting. Short cutting fuel lines over a hot engine, with a gravity feed bottom tank fitting, not a good practice.
But as for using the old pump, even though it appears to work, I would go ahead and replace it. If it's been running open, no fuel through it, dirt and whatever that may be inside, dried up diaphragm, asking for trouble trying to use it.
Not only will it release whatever is inside into the carb, if (when) the diaphragm goes, it can fill the crankcase with gas, and drain the tank on the ground, or worse!
The old mechanical pumps don't like ethanol gas to begin with, so please, start with a new one, not worth the chance!
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Today's Featured Article - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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