The fuel fill issue is often related to the fuel door release. When you press the fuel door release button it unlocks the door then it opens the vent valve to open the tank vent to atmosphere to allow the tank to fill and vent as it fills. If the vent valve doesnt open or the vent is blocked the pump will keep clicking off. @EasyEd
since your issue is related to rdm replacement I would say the vent valve is not plugged back in or as @Harleyguy
said a kinked vent. @tom1
I would make sure the fuel door release system is working properly. Make sure the door closes and locks also it depresses the little microswitch to signal the doornis closed. Then when you press the release button it chould click then the gas cap light should come on the dash. If this isnt all working properly the vent valve wont open. Also, this is what signals the DIS to resample the fuel level. So the fuel level wont register if the fuel door release system isnt functioning.
Many customers have had inoperable release solenoids or have had to break open their fuel door. When they do this they have the same 2 symptoms no fuel gauge registering and cant fill. This is because they are not pressing the fuel door release button since the door is broken.