My FSR will not work no matter what I've tried. I've switched the pin, and my other FSR works, but I'm using both at the same time. When I sent the data to the Serial Monitor, all I got was 0.
Sounds like your Force Sensitive Resistor or the pull-up resistor is faulty or not connected to +5V. Use a multimeter to check the voltage at the analog input pin to make sure that it changes as you apply force.