I'm not familiar with that module. We all know the engineers who design cars are all insane. No other car needs a module to control the fuel pump. Wish I could help you better, but frayed and rubbed-through wires in the passenger compartment are real common on GM cars. Unfortunately, any computer module adds a whole new level of complexity and unreliability to our cars.
If you could get it to where the short is constantly present, simply unplugging that module would identify it. If the fuse still blows, or my test light is still bright, you would know the module is not the cause.
You can't really approach it that way when you have to drive the car to make the problem act up. You might consider finding a used module in a pick-your-own-parts salvage yard and popping it into your car. If the fuse still blows, you'll know the module isn't the cause. You're lucky it isn't a miserable newer car. Computer modules must be coded by the GM dealer before they will work, and you must buy new ones. Used computers won't work.
Wednesday, January 4th, 2012 AT 4:01 AM