Q45a noise at the rear

[rover3l]

When the car is runnig it sounds as if a pump is running at the rear of the car. Is this typical for the Q45a?

David

[Rex]

From the rear decklid, sound like an amp going bad on one of the speakers??

Search on Fuel Pump

[maxnix]

And it would probably be best not to run the car until the pump is replaced, as you will discover why when you read the posts.

[rover3l]

I will search on the fuel pump topic. I am intrigued by the thought it might be an amp. Would this make a noise even with the stereo turned off?

[DAEDALUS]

No. It's the pump.

[rover3l]

To be more precise the sound is a light humming sound which is evident when the car is idling but too low in volume to hear when driving. Any advice on where to source a pump. I can see that "Auto Parts People" have them.

Thanks

David

[Rex]

Oh, the "amp" comment was more a descriptive, than a possible source.

If you can hear it easily at idle, do as I did and pull the radio fuse and see if it changes, then pull the fuel pump fuse and notice the noise stop before the motor stalls.

It's a DIY believe it or not.

[Rex]

Joe infinitipartsusa.com Don't forget the o-ring

[Q451990]

The amp is definately not the noise if the radio is off... all four amps are fed by a relay (behind the ECU)that's controlled by the radio.

You're at about the right mileage for the noise to start a new pump... 75K right? My first was loud when I bought the car at 80K. Second was about the same but I let it go too long... you'll find my post with the fried FPCU in your search!

Heath

[QShip]

Replace the fuel pump ASAP. If not, you will have to replace the pump and the controller. The controller cost alot more than the pump.

[Q45tech]

We are narrowing in on the current that melts the controller.

My estimate is that a warm idle reading exceeding 5.000 amperes is the danger point..........not to say lower might not fail depending on temperature in trunk.

3 brand new ones measured so far 3.1-3.5 amperes.Again mine [3rd one] is at 4.2 amperes [70F ambient] and started the hum 30 days ago. I am measuring every week now. I guess I'll have to waste a controller to find out ..........then there will still be a variance.