Gas Tank issue...

No,climb under the car on the passenger side and have someone bounce and shake the car side to side. It's down under the trunk floor. That seal is to seal the tube to the trunk floor.

Sorry man, but I have to disagree.
I changed mine in 15 minutes through the boot in the trunk by taking that rubber cover off and the filler neck loose from the fender.
A little silicone or grease on the tube going back in and it was a breeze.