Fuel data center comes on and off. Has anyone else experienced this?

Yes. Mine just started doing that about a week ago. It goes out and all I get is a "d" indicator light. So far, nobody can tell me what that "d" means. It was a hot day, I thought it might have been low on coolant, so I put some directly into the radiator and bypassed that plastic reservoir. That "d" went away temporarily. but came back a week later. Since I cannot trust the Fuel Data Center, I now use the odometer's trip distance button and I fill up every 300 miles.

I also have a 93 DeVille. When I was driving all my lights would flash on then off. The fuel gauge & fan would turn off. A little while later the same thing & everything would go back to normal. Got a new BCM & its been good ever since.