I'm curious to see if anybody is running a a Rick's tank on a 67 or similar Nova with a in tank pump? My problem is not pump noise related but a thumping type noise when going over rough surfaces... I'm not exactly sure if it's the tank at all because the car sat apart in the garage for a long while and I don't remember if it made it before the tank install or not. I figure its the tank flexing when the rear goes over a rough surface. Any thoughts or people with a similar issues???