Hi Greg
Individually...
Disconnect it's cable connector if possible.
Use a MultiMeter and a couple of jumper leads to +12v & ground.
Or the cheap tester below will help.
Sometimes this is better done on the bench where you can see whats going on.
Relays are just using a 12v low current electromagnet being used to close a set of internal switches (contacts) to supply 12v to the Fuel Pump. The Relay Contacts carry a higher current than th fine thin wiring used on vehicles these days.
The fuel pump can be tested & run without the relay to prove it is working. Use jumper wires to Battery.
The relay can also be actuated (tested) using jumper leads & a multimeter. When the internal coil is energised it simply pulls switch contacts closed. A Multimeter across the contacts pins will prove this.
Relay Pin Numbers
DIN 72552 defines contact numbers in relays for automotive use;
Relay Wikipedia the free encyclopedia
Tools
Amazon com Power Probe PPH1 The Hook Ultimate Circuit Tester with Smart...
The Cheaper Tester
Automotive Multi Function Circuit Tester with LCD Contact Electrical...
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