how to tell if the fuel pump module is bad?

if you're still driving the car,then the fuel pump is working. if the fuel gauge is not reading the correct amount of fuel in the tank,then either the sender/float/switch got damaged when installing the module or if not a good quality module,the sender may have just failed,or you have a bad fuel gauge. What is the code for the check engine light and where does it show you the amount of power the fuel pump module reads and what is it showing you?