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Generally to diagnose this, I apply power to the fuel pump from under the car at the fuel pump wiring harness using a Power Probe while having a fuel pressure gauge hooked up so I can see if it is working. (in 90% of these cases it is the fuel pump and not the relay, this is why I check the pump first). Also, while your under the car and at the fuel pump wiring harness. You can have someone cycle the ignition key and check for power going to the pump from the relay. If you do not see power coming from the relay, then the next step is to check for power going to the relay. If you have power going to the relay by not coming from it(when you cycle the key) then the relay is bad and will need to be replaced.

Reference Link : How to use a Multi-meter

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