Replace gas tank and sending unit or not?

Proto said

Hey everyone, sorry to drag this thread out of the shadows but I am having a related problem.
74 Dodge Dart Swinger 318 that is only taking 4-5 gallons. The pump shuts off and we can't fill anymore. My son normally drives it and the other day he ran out of gas (teens). He was only able to put in 5 gallons. What should I be looking for here?

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Look under the car to see if the tank is crushed. Sounds like the vent is plugged. Some type of mud-packing insect did it to mine and a friends locally. Not fun to clean out, but it's also a low-tech process once you locate the tube.

I too have to flip the vapor recovery nozzles upside down to fill my tank. It always dumps a cup of fuel on the ground without warning when full. In Nevada, they don't have vapor recovery nozzles and there is no issue. California Lib's are always using a sledgehammer to fix a Swiss watch.