Quote Originally Posted by Holdmybeer View Post
If that is the same material my 2015 tank is made of, that bulge is mold created and not pressure created. I.E. made that way.

The fuel tank should always be vented and not allowed to pressurize. I know 70-80 gallons of fuel creates a large load but should be fine inside the tank. If you are worried about the battery case rubbing on the plastic, take dynomat or similar (foil coated) and stick it across the tank. It will protect the tank from any abrasion and being foil coated won't create static charge.
Good to know, still have some from doing sound insulation.