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View Full Version : Gas Tank Sloshing?


PsyDoc
08-20-2007, 01:44 PM
Hi.

My wife just purchased a CX-9 Touring this past Saturday. Early Sunday morning, I took it out to see how it drives. Air conditioning and radio were off, so there was no noise in this "ultra-quiet" cabin. When I hit the brakes (not a panic stop, just firm), I could hear a sloshing sound coming from the back. I rolled forward about 5 feet and hit the brakes again...slosh, slosh. I assumed it was the fuel sloshing around and was somewhat concerned as this should not be happening on such new vehicles. Doing some internet searching, I found that, in some gas tanks, baffles only go up about 1/2 way or so. All the test driving my wife did, the car had about 1/4-1/2 tank and the radio and A/C were on; of course, they filled it up once she bought it. I went to the dealer today and my wife's salesman and I checked out another CX-9. No sloshing, but the tank had less than 1/4 of a tank. The salesman is going to fill it up and try it and then is going to call me back. Anyone else noticed this? I would not have noticed it otherwise, but it was early morning, no traffic noise, and all the accessories were off. With the radio on (not very loud), and A/C on, you cannot hear it.

DashingMax
08-20-2007, 05:16 PM
No "sloshing" here. Nice and quiet!

PsyDoc
08-20-2007, 05:28 PM
The service manager called Mazda and Mazda said that some sloshing can be heard when the vehicle has a full-tank, due to the baffling design of the gas tank. Once the gas level goes down a bit, the sound will go away. I only noticed the sloshing with a quicker than normal stop, as stated in my initial post, and only with a stop. A dip in the road, going up or down a driveway, etc. did not cause any sound. I am just too damn anal-retentive and have the curse of noticing EVERY little thing. :)

PsyDoc
08-20-2007, 06:57 PM
Wife got home and I did what I did on Sunday...no sloshing, weird. My wife thinks I'm crazy (nothing new there) and I'm hearing things. The gas indicator is not even 1-tick down from the "Full" indication on the fuel gauge. Perhaps the dealership "overfilled" the tank on Saturday evening. Oh well.

Craig-CX9
08-20-2007, 10:10 PM
...has anyone noticed that each tic is 1/12th of a tank?

wakblak
08-20-2007, 11:08 PM
Never noticed it, but I will drive quiet and see if there is any sound since I'm on a full tank.

davidleg
05-09-2008, 07:49 PM
I have also noticed the sloshing with a full tank. but i have no idea why it does it.

TheMAN
05-09-2008, 09:01 PM
new cars defies physics and their gas tanks stops gas from sloshing and moving about :rolleyes:

get real!

cisnale
10-26-2008, 04:11 PM
Same thing happened to me while backing up from my driveway. Usually goes away after getting below 3/4th of a tank.

ceric
10-27-2008, 01:49 AM
Yes, I noticed the sloshing as well when pull into garage (turn down the music volume). This usually happens when the gas tank is 90-95% full. This happens to many vehicles I have owned. This, of course, if a design issue, but I wonder if there is anything Mazda can do at this point. I certainly hope so.

MacMaster
10-27-2008, 10:30 AM
haha I have the same problem but I dont even care about my cx-9 anymore, my tank is sloshing, my driver side mirror is vibrating, when I steer , a weird noise comes from steering box, my cx-9 can only go 260 miles with a full tank, the black plastic fenders turned into light gray, the output in trunk doesnt work anymore, my dealer doesnt have a service schedule, I got 15k miles on my car and they only change oil but nothin else.

Malmskov
10-28-2008, 03:23 PM
Same thing here. As all of you are saying it is only when the tank is full.