Fuel pump connector/transmission fluid level?

Hello,

I have a 2014 Hyundai Veloster 1.6 DOHC engine with 6s automatic transmission, I usually do my maintenance myself, and this time I have 2 questions. First, I was working on the fuel pump assembly to change the fuel filter and fuel pump as a full fuel system change (no symptoms or codes but as a full change since it's almost 200k km since last change). In the process of removing the fuel pump connector the latch that looks like the connector to the fuel pump broke, the connector itself seems okay only the latch broke and the connector when pushed stays in place and with moderate pull does not come out.

Now my question or more like a concern, I am not a mechanic nor an electrician, so does the loose connector make any fire hazard inside the fuel tank if it got loose or unseated? Like does it make a spark or something when it gets loose. I know this might be a ridiculous concern but due to the lack of information from my side I wanted to ask for safety reasons since usually I do fill my car with a full tank until empty and when it's almost empty it will be filled with gasoline vapor and gasoline vapor can ignite under any spark.

Second, I changed the transmission fluid following the attached picture, added 3.7 liters of fluid as the full transmission needs 7.3 liters and when changing it this way it needs half of it so 3.65 = 3.7 liters. The issue this time (I did change it like 3 or 4 times before) is that this car does not have a dipstick to check the level instead it has a plug that you remove to check the level. The issue is that following the Hyundai process when the temperature reaching 50-60 degrees Celsius and removing the plug no fluid comes out (car running) so, I added the rest now the total is 4 liters the same no fluid are coming out. As soon as switching the car off and removing the plug fluid comes out from the plug. When changing before I used to check while the car are off but the picture attached says that the car needs to be on. So, now what do you recommend I add more and check it while the car are running? In this case I will be adding more than what should be added (3.7 liters).

P.S
I searched for the connector online and through my dealership, unfortunately it seems Hyundai dose not supply it alone, I need to buy the whole fuel pump assembly. Also, the car works no problem. It's only a concern from my side as I am in Saudi Arabia and the weather here reach in a good day 50 degrees Celsius.

Thank you in advance.