The fuel pump relay has 4 leads. one is positive to battery, one is negative, ground, one is input voltage(on/off), and one is load (to the fuel pump +). Locate a 12 volt dc power source and connect the negative to the relay ground, and the positive to the relay input voltage lead. When 12 volts is applied to the input voltage, you should hear a click of the relay opening- additionally, if you have a multi-tester, you can also check for continuity (resistance, ohmage) by connecting the multi-tester to the 2 other leads. when the input voltage lead receives the 12 volts, you should hear a click AND the multitester should detect continuity in the circuit, and lose continuity when the 12 volt is removed from the input voltage lead.
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