Fuel Pump Cycling After Shut Down

I think I'm hearing my fuel pump cycle after I've turned the car off.
It's in the gas tank area and it's a whirrrrr, pause, whirrrrr, pause.
The pause is about 5 seconds and the whirrr is about 2 or 3 seconds.

The car is an Infiniti G20T, and apologies for asking here, but I'm used
to this group and its feedback is so good.

Is this a problem to worry about? I've not experienced any kind of
trouble related to this sound, but it's not a noise I've heard from
another vehicle before and I'm curious what's happening. And if it is in
fact the fuel pump I'm hearing, why does it keep cycling after the
engine is shut down? TIA.

 

i notice a similar sound on my 98 cx hatch, but only if ive been using
the AC.

 

Well, I'm an a/c freak and use the auto climate function so mine's been
on as well. Wild. Wacky.

Do you think it's sucking battery power when it's whirring? I haven't
sat there and listened to how many times it cycles, but it's definitely
doing it more than once or twice.

 

mines more like a "sighing", or possibly a "whining"... like,
"ahhhhhh.... ahhhhhh............." been like that from day 1, also.

i think its something to do with the AC powering down. maybe relieving
pressure?

try driving with no AC for a while, then listen for the sound when you
shut the car off. mines DEFINATELY AC related.

 

Heh. Someone needs a file for noises and the way they should appear in
type.

It's finally getting cool enough out here (we're up in SClarita where
it's hotter than you) so I can experiment without using the a/c. I'm not
even sure the noise I'm hearing cycles every time the car is shut off,
but thought I'd throw the question out to see if it's a common problem.
Tanks for giving me the feedback, Mike!