What's the problem with the slapping sound of the turbine with loose throttle at Buick Angola electric fuel filler?

Buick Angola electric refueling door releases the throttle and the turbine turns over, because:

1, the throttle position sensor or air flow meter is faulty. These sensors need to be checked for faults.

2. The fuel system is blocked or insufficient. It is necessary to check whether the fuel filter is blocked. If it is blocked, it needs to be replaced or cleaned.