Quill Pig Eats Truck!!!
Mine was a porcupine, on my last gasser. F150, that stayed on the weekend place we commuted to on weekends. Get there late one Friday, so we order pizza and I get in the truck to go get it. Starts a little hard and I get an emissions light. Smells like it's runnin' kinda rich. Figure the light and the smell are connected. Power flattened out once, but I got it back. About eight miles out the road, the low fuel light comes on. Great, I had 3/4 tank when I came down off the mountain. Pull up under the lights at the pumps across the street from the pizza joint and pop the hood so I can look for the leak. Look, nuthin' -- I can hear it. I look up underneath, and gasis cascading down from somewhere right onto the muffler and exhaust. :--) Prudence led me to shut 'er down right there.
Upshot was, a porky had got up under there, gnawed through an armored fuel line, three harnesses (transmission control and lighting) and gnawed just about all the undercoating off the truck. Only sampled of a brake line and the spare tire. About $11k to get it all fixed.
Come to find out dorF uses a pine-tar base (read "prorcupine bait")for their undercoating.