Recreational Vehicle Lpg Tank Valve/gauge problems of the 2011 Hyundai Sonata

Gas gauge worked, only, intermittently. Would indicate empy after a fillup. At about 3/4 of a tank, would start showing accurate reading. Now seems not to work at all. This has been going on for 2 years. Now, it is stuck on 1/2 full no matter how much or little fuel is in the tank. My safety concern is running out of fuel on the highway and being rear ended by another vehicle. Online, I have found. Many others complaining about this issue.

On March 1, 2021, I noticed an odd smell while idling in line. Turned car off until it was my turn. The smell was gone once I turned it back on, so thought it was another car and drove to work. That evening, smell started again after driving a few miles to parent's house. Parked the car at parent's and arranged to drive it to mechanic the next morning after having my father confirm there was water in the radiator and the oil wasn't too low. Engine temp gauge was normal. Check engine light was on, but had been for the length of time I had car. I had it checked several times- issue would be supposedly found, but it would always come back on. I was led to believe it was a faulty sensor issue. There was nothing obviously wrong when we looked under the hood and had no reason to think it would not be safe to drive the short distance to the mechanic. Next morning, March 2, 2021, I intended to drive the car to the shop so they could address the issue causing the smell, and father followed behind. Car seemed fine at first, but after a couple of miles driving on surface streets, the smell came back. Pulled over and turned off car, thinking that I would need to have the car towed the remainder of the way. I saw something come from under hood. My father, who had been following behind, asked me to pop the hood. As I climbed back in the car to pop the hood, I realized there was smoke inside the car. I got out, told my dad that there might be a fire as there was smoke inside the car. As we had that discussion, smoke started pouring from under the hood, and we backed away from the vehicle and called 911. Within seconds, there were visible flames and the whole front of the vehicle was engulfed in flame. Today, March 10, 2021, I was made aware that 2011 Hyundai Sonatas were included in a list of vehicles known to catch fire, so I am filing this notification.

After putting gas in my car the gas gauge is everywhere. I can stop and restart my car after filling it and it will say I'm empty. Whether I'm actually driving at the moment or stationary, the gauge will constantly move up and down. I have to keep an eye on my mileage to know how much I really have. It has been happening for over a year now. I've seen other stories online of many others having the same issue.

Fuel gauge is not working properly. When gas is filled, it display the full tank gauge. But after ~ 100 mile drive, the fuel gauge drops to empty tank with alarm sign. At first it happened very rarely, but now (69000 mile), every time the fuel gauge drops to empty tank once it is drive >100 mile after full tank.