Whining in back seat/trunk

[RCA1186]

Hey guys, just thought I'd throw this out and have you guys toss out ideas as I'm semi stumped. For about 4 days I've been getting a high pitched whining sound coming from the rear of the car, or at least that is where it sounds like it's coming from. I'll be driving along normally and then the sound will start, very high pitched and sort of sounds like it might be electrical like a motor but hard to tell. The noise will last for a minute or so and go away. IT does not sound like the usual air shock fill sound and as far as I know that wouldn't activate while I'm driving but I could be wrong.

Now, from where it sounds like it is coming from (passenger side rear near the back seat) my guess is the fuel pump is on its last legs. But here are the facts.

-It's a pretty high pitched whine, and to me sounds like it could be an electric motor but this is a guess.
-It only lasts for a minute or so and goes away
-The sound does not change with the RPMs - i/e when I accelerate it remains the same
-The sound came on again yesterday after going over a hard bump but still faded out on its own after about a minute
-I have not been able to find a spot to safely pull over and investigate since it started as it goes away after a minute or so
-No apparent change in performance of the car as far as acceleration, idling, driving, and starting
-The sound remains when I shut off the radio, turn off the blower, and does not change if I operate the power antenna (which is fully functional)
-Shocks and ride seem to be the same
-Air ride seems to be functioning normal. I sat in trunk with key on and pump activated like normal.
-No CEL or warning lights.


I was thinking fuel pump or something under the back seat but I want to be sure and I'm also stumped that there are no other apparent symptoms. If it's the pump, obviously I'd like to change it before I end up stranded or left high and dry in an intersection haha


Any thoughts?

have any other ideas feel free to toss them out. Thanks!!

[AUROD X]

Check audio amplifier for loose connection or amplifier itself. In my past I had a experience of such on another car.
The other experience that causes that whine sound is definitely the fuel pump.
The fuel pumps job is to push fuel to the engine till it's last leg. that whining will come and go then get louder.
I wish you LUCK on finding your problem soon and don't end up on the road.

[aphex]

The timing may be difficult but I've heard that a loud fuel pump can be heard through an open fuel cap.
Possibly the CAT getting clogged? Or is it coming from inside the cabin?

[RCA1186]

It sounds like it's coming from the back area, really hard to tell if it's inside or in the trunk, I figure fuel pump because of the access port being right in the area where it sounds like it is coming from. Unfortunately I can never get pulled over in time to check as I was going to try listening through the fuel cap as well.

Not a bad idea with the amplifier AUROD X, they way it works it kind of sounds like it could be a loose connection as it's intermittent.

I will check on that after work as well as try to get pulled over in time next time it occurs.

[tigger]

Whew! From the title, I thought you were talking about kids, lol! Knowing full well that children should never be transported in the trunk of a vehicle, no matter how tempting a solution that might be...

Seriously though, I'd guess fuel pump as well.

[RCA1186]

Well the sound hasn't returned since I made this thread. I'll keep it updated.

[akble]

power antenna ?

[RCA1186]

Almost a year now and haven't heard it again....strange

[AUROD X]

Good to hear that but then again keep an "EAR" out. 🙉