Question for you jeep guys

#1
My friend has a 2004 LJ. He was driving this morning hit a bump in the road and the fuel gauge went to empty a few miles later it lost fuel supply to engine. Towed it to the house and it cranked right up.
Loose connection or something going bad?

My questions- 1. Is the pump mounted inside the tank?
2. Are the sending unit and pump all one unit?
3. Isn't there a check valve of some sort on top of the tank?
4. Any ideas?

All parts will be replaced when tank is pulled. Any upgrades or things we can do to prevent this from happening again?
 
#2
The sending unit and pump are inside the tank....and very expensive nonservicable to boot....

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