RE: fuel bag plumb
glad you had your money refunded.
Like I said earlier there are some brand of IV bags out there that are made from recycling and they don't hold up to fuel.
I also noticed some say that they empty there bag every day.......that's kind of different from what the majority are doing, your suppose to leave fuel in the bag (not full, just around 1/4) this will prevent the bag from hardening.
But if that system works and the bag holds up, don't change your method.
Dan.