Fuel pump sound
When putting the ignition key in "ON" position, right before cranking up the engine, I can (barely) hear the fuel pump that does a "bzzzz" sound, like regulating the fuel pressure. It happens every morning, after the Jeep has been off during the night. If I ride, then stop for some short period of time, it either doesn't do the "bzzz" thing, or it makes it very short.
At longest, it lasts one second (overnight or more that it sits still).
Is that normal?