Presuming this is a powertrain warranty claim, I would check to see if there is a limit on the compensation GM will reimburse you for loss of use of the vehicle. Their warranty may indicate some limits, but I doubt that any small claims court will abide by that limit and would thus award damages based upon actual loss.
If there is no limit, you can just about lease another vehicle and expect to get compensated, and the dealer can then take all the time they like finding a replacement or even building a factory to make a new fuel pump module. I would also expect that the warrranty would be extended for whatever duration it takes them to repair the vehicle.
Welcome to the joys of globalization.