That still doesn't sound right though. I had gas on my hands and arms for at least half an hour yesterday while doing the job. They must be putting some additive in your gas out there for you to get chemical burns. No matter what, that fuel filter job is a messy one so be ready for it. I think it's definitely worth changing though. I can't believe Toyota would say it's a non service item when everyone knows that filter eventually get clogged. That's what they do, filter out the bad stuff.