07 Sportsman 500 efi fuel power

I am a newbe here, so if this is not in the correct place, sorry.
I have an 07 sportsman 500 efi, when I am testing the plug to the fuel pump, the meter flashes 13 to 14 volts when you turn the key on and then it drops to almost nothing.
The only problem I am having is no constant power for the fuel pump.
Can anyone help with this.
I have tested the plug using different grounds.
The atv just died while riding it a few weeks back.

Thanks for any help

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