Before you start any troubleshooting by checking fuel pump voltage release the hood of your car and switch off its engine then put it in parking position. Locate fuel pump relay and power connections for your fuel pump When they are operating correctly, these connectors typically hold 12 volts of power. Set your multimeter at the DC voltage range and then determine the voltage present at the fuel pump from its terminals. Positive probe at the pump power wire side, negative lead to a ground point (by the way, using multimeter )

When the fuel pump has been properly bolted, it should receive 12 to 14 volts when you turn the ignition key ON FULLY. This is because when the voltage reaches below 10%, fuel pump performance will suffer leading to incidences like stalling and poor acceleration. A reduction from 12 volts to 10.8 volts, for instance, may inhibit the fuel pump's ability to maintain appropriate fuel pressure—usually somewhere between 40-60 psi—and thus lead to irregular engine performance.

When testing the voltage make sure that the battery is fully charged. If the reading is below 12.4 volts, this can cause false readings A battered battery with three to five years of life in it can also affect fuel pump voltage readings by as much as 15 percent, and has resulted pump-related misdiagnosis.

You will also need to inspect for loose connections or corrosion which can lead to gremlin-worthy intermittent voltage drops. A corroded connection could reduce voltage by as much as 10 percent, and that's enough to mess with the fuel pump. During the early 2000s, some high-profile recalls of certain models were associated to voltage problems that resulted from bad wiring, leading to several stalling issues.

Lastly, wearing electricity safe gloves and goggles are necessary to prevent you from shocks from electricity while interacting with electrical systems. Again, voltage testing is not as dangerous if done correctly but ensuring that the tools used are also rated for automotive use and proper grounding keeps all scary things away.

For further details on how to keep a Fuel Pump, see: Fuel Pump.