When you drop the tank again maybe consider cutting the access hole in the trunk floor and making a cover for it. Sure saves a lot of time and aggravation when messing with fuel senders and if you have a trunk mat it will cover the hole and most often no one is the wiser any mod was done.
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=227773#forumpost227773 You may not have done anything wrong. Sometimes it does take a lot of cranking to bring fuel up thru the lines and is one of the reasons many of us have electric pumps installed near the tanks that we can switch on and off. Great for situations such as filling the lines and priming the carb if the car sits for a long time. Also good for pressurizing the line on the suction side of the pump where many have speculated the vapor lock problems really occur. The low pressure fuel on the suction side allows the volatile gasses so prevalent in todays fuel to expand and escape creating a large air bubble that does not want to pull thru the pump.
There is one thing you might check on the new pump. It is possible something happened to the pump and it is not working but it would also be good to check the port arrangement. There have been reports some of the rebuilt pumps have the lower casting mounted 180 degrees off putting the suction side where the output side would normally be on some model Packards. If you just installed the pump without verifying its ports or operation that could be the issue. If you find the reversed casting it requires the pump to come off the engine and the screws removed so the bottom casting can be oriented properly.
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