Her is my theory: If it was the canister vent solenoid that failed, it could be possible that the solenoid may have not vented, causing negative pressure (vacuum) on the plastic tank, thus imploding the tank. For example, take an old plastic water bottle empty, suck on it and it will collapse. If you are low of fuel and the Vapor management valve is commanded open to send the evap fumes to the engine to burn, and the vent solenoid has failed, it will not pull the stored fumes from the charcoal storage cannister. Just like the water bottle it will collapse, and possibly bending the fuel Delivery Module ( Fuel Pump Rods). My theory.