Don't check cattle in a Cadillac! :(

1997 Cadillac Deville, Northstar v-8, 94,000 miles. I bought this car as a 40th b-day present to myself, not to long ago from a private seller. I felt, and still do, that the car was CHERRY. Truly excellent condition. I have taken it on a few little MPG checks and I was getting 26.4 mpg @ 58 mph (average). The SES light came on but never stayed on for very long.
Yesterday, dumbo me, I had to go check a cow down on my Dad's ranch (yes, I know, don't check cattle in a cadillac! :(). Drove, VERY SLOWLY, down a dirt lane, I hit a semi deep rut, sounded like it just graised the front part of the skid plate (?) On the front of the car. Then, Goldylocks, made an odd noise, like an rrrrrr something (tough typing the noise). I immediately stopped, turned the motor off, let her rest. Started the car again and came home. On the way home the SES light went off. I thought great, maybe 10 yers of life kinda settled the car and all-swell.
Not the case! (I could just kick my self!) Drove to get some lunch, on the black top. Got up to a speed of about 68 mph, as I slowed down, at my turn off, I was FUMIGATED with the smell of fuel. Thought it might be the car in front of me. The smell subsided. So I took it on another little road trip to see if it would do it again. While I was driving, there was NO smell of fuel unless I slowed down to turn or came to a complete stop.
When I parked it into my drive way and opened the hood, OMGosh, silly silly me, big fuel smell again. There is also no significant leaks of fuel, that I can see on the drive (I understand that the fuel will evaporate) What did I break?
Thanks you, anyone that helps me with my problem and I promise I won't check cattle AGAIN in Goldylocks.