Several times when cleaning my interior or installing electronic mods I have noticed my fuel pump will make a whirring sound. It does it about every 5 minutes. My keys are in my pocket or in the ignition(off) so I dont know why it's getting power. Is this a normal thing or does it run when not needed? I assume it's doing this to keep pressure for when I start my car... so I may have a leak in a line or seal. Or is it just freaking out?