Here are a few things you can check to troubleshoot the fuel pump voltage:
1. Check the battery voltage. If the battery is low, it will not be able to provide enough power to the fuel pump.
2. Check the fuel pump relay. If the relay is faulty, it will not allow power to flow to the fuel pump.
3. Check the fuel pump fuse. If the fuse is blown, it will prevent power from reaching the fuel pump.
If you are not comfortable troubleshooting the fuel pump voltage yourself, you can take your car to a mechanic for diagnosis and repair.