I'm leaving this forum and have deleted all my work in this thread.

 

Dont top it off next time and see if it still happens.
I am betting you are sucking fuel in through the purge valve because the tank is "to" full.
So basically you are flooding out.

 

it may not hurt to blow some air done the vent tube. I found a bis *** spider wed in mine.

 

first alarm spiders - now gas spiders - what's next - axle zombies?

 

My generic *Guess*

Filling in too much gasoline.

You are bouncing the bumper - burping the tank - trying to get it all
in??

You can get in a few more gallons that way.

And, - you may be flooding your charcoal evap can
and that makes the rover run rich for +30 minutes.

Getting some smoke out the back when this happens?

 

The modern fuel system is very complicated, supply line, return line, EVAP line, EVAP canister, purge valve, EVAP canister return line.
Both return lines return excess fuel directly to the gas tank.
The fuel return line returns the fuel that is not needed to run the engine, the fuel pump supplies more fuel than is needed at all times, fuel pressure regulator returns unused fuel.
The EVAP (evaporative) line is a vent for the gas tank, the gas tank is 100% sealed from the atmosphere and when the gas gets heated/sloshes around it evaporates and builds up pressure inside the gas tank.
This pressure needs to be vented, the EVAP line runs the vapors to the EVAP canister under the hood, it then condenses the vapors back to liquid and returns it via the purge valve to the gas tank.
If that purge valve is stuck open fuel will get past it into the EVAP canister.
The EVAP canister also has a vacuum line running off of it to the engine, the engine sucks off the vapors as it runs, if there is actual liquid fuel in there the engine will suck in the liquid fuel thus being flooded out.
Replace the purge valve.
Make sense?

In the old days gas caps were of the vented type and the vapors were vented directly to atmosphere, bad for the ozone of course.