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I see three possible problems with the rebuild: Either the pickup tube doesn't extend the bottom of the tank, the filler tube was set into the tank too deeply (so the gas can't be filled above the end of the filler tube inside the tank,) or your gas gauge is out of calibration, and you're filling up the tank when it's only a little more than half empty.
The place to begin would be to remove the gas gauge sending unit from the tank.
You can determine if the sending unit is out of calibration by measuring the depth of the tank through the gauge hole. The sending unit arm should drop only to a point about 1/2" less than the depth of the tank. That should leave you with a small safety reserve when your gauge reads EMPTY.
If the gauge flops around like the current is being interrupted, it is probably the windings on the sending unit. You can use some fine wet-or-dry sandpaper to carefully clean any buildup off the windings.
I actually had to take my sending unit apart to fix it, but hopefully you won't need to go that far.
If you don't find a problem with the sending unit, use a flashlight - preferably after dark - to try to see the ends of the pickup and filler tubes.
If there's a problem with those, you're on your own!
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