2022 07 27 Cox Helicopter with Jim R

Trying to fly a Cox helicopter after 23 Years. The last time it was flow with his boys it flew, now trying to fly it with the grand children, it won't fly. The engine was changed because the original was seized. Here we are testing after his grandchild left. I'm thinking the centrifugal force is forcing all the fuel away from the pickup tube. Have any ideas why this doesn't fly?