Gen 2 fuel tank sending unit / fuel bladder issue

I have read through multiple threads regarding the issues that can result from a bad bladder or fuel sending unit.

Facts:

2007 gen 2. I have owned since 2009. 130k miles.

I live in southwest Florida so its always warm-hot.

I hooked up my OBDII. - no codes showing.

I have reviewed the supporting fuel system diagram from the other thread.

Issue: Inconsistent readings and fluctuations coming from the fuel gauge. Blippis on gauge can count down sequentially or sometimes they drop 5 blips in on moment. Once the fuel drops the blips do not go back up, only drop. Sometimes it’ll read empty and I will refuel and it take 2 gallons until reading full again, other times it’ll be empty and the most it will take since the problem started is about 6 gallons before the gauge reads full.

Manually calculating the fuel economy I’m getting around 150 to 290 miles from full to empty depending on the specific tank. I have been threw 3 or 4 fuel cycles at this point. On the second fill up since the issue started I put some seafoam in the tank and ran a whole tank and that seem to help with the issue but by no means restored normal capacity.

My thought was if it was the fuel sending unit malfunctioning due to the ethanol and the gasoline gumming up the float on the sending unit then maybe this could help create soother operation and restore normal operation. Just a deductive guess on my behalf…. The other thought is an issue with the actual fuel bladder not expanding to its full 11.9 gallonish capacity anymore.

question: a) I assume you can not send an inspection camera down the fuel line without potential getting it stuck or causing damage to sensors etc. to see if the fuel bladder is creased etc when the tank is reading full.

b) Due to the inconsistent nature of the reading I do believe it is more related to the fuel sending unit float not accurately leveling out or potentially a clog in the fuel tank where the sending unit is housed causing inaccurate fuel leveling so does anyone think more sea foam cycles could potentially resolve the issue as it did help get more mileage out a tank.

c.) The final and most important of questions- does the vehicle shut down when it runs out of fuel, or when the sending unit tells it it’s out of fuel?

For example l, if I have driving 180 miles from fuel to empty (blinking blip on fuel gage) is the computer going to shut the car down based on the fuel sending unit communicating its empty even there could still be 5 gallon of usable fuel?

Or is the vehicle going to run until all actual gasonline is consumed and the vehicle stalls out and dis regard the faulty sending unit?

I can manually calculate fuel consumption all day - easy enough but I really dont want to run it out of fuel If my bladder capacity has been decreases due to a frozen/stiff fuel bladder which is only allowing the vehicle to hold a portion of its full 11.9 gallonish capacity.