It is possible that these issues of the fuel filling and misfire are connected but that is not highly likely.
More than likely, you have two issues, but we should start with a fuel issue on the engine.
Let's start with fuel pressure and see what you have at the rail. If the fuel filling issue and misfire are related and you have low fuel pressure, then we need to suspect the filter is clogged.
However, fuel filling issues are normally caused by an obstruction in the neck or in the tank. So, I would use an inspection camera and put it down the neck just to make sure it is clear and not blocked.
Then we can address this and move back to the misfire.
I am attaching the info on the filter which is part of the pump in the tank. The nice thing is you have an access panel, and you don't have to drop the tank.
This can also help to inspect what is in the bottom of the tank but let's start with the pressure and go from there.
Images (Click to make bigger)
Saturday, January 15th, 2022 AT 2:25 PM