Easy enough to find out. It will make it's way to your filter sooner or later. From today on, put a spare filter in the trunk with a flashlight and whatever else you'll need, ie; snap ring plyers, screwdriver.
I've seen sugar in a tank and, (who was it? One back? Can't remember.)
I agree, it just sits there.
Plan B: I'm wondering, take a pint of gas to your police department and ask if they send it to the lab. (They all have access to either their own lab, county or state.)
Plan C: Remove the tank and while it's out, clean up the mounts, the underside. Topuch uo with paint. Reassemble knowing it's fixed, or cool and looking good too.
Just an idea.