No bearings in an LA, it has bushings. You may want to take a look at that plastic needle valve assembly to see if you have a crack. In a crash the clunk often is pushed to the front of the fuel tank and gets stuck in some odd angles like forward and up. That happens all the time. It really does sound like an inside of the tank problem though. If it was a needle valve problem it would be a problem right from the start. Sounds like the engine is just running out of fuel early at some point. Checking the tank only takes a few minutes. Get off the computer and go look!!