Thud after initial acceleration

[omega0021]

Hello, just wanted to see if anyone else is experiencing this.

There is a thud that happens after an initial acceleration. It is subtle, however noticeable. It seems to be originating in the back of the car. Furthermore, the thud only seems to present itself after a full tank of gas. I am not sure what it may be. I know its not the clunk; I already had that fixed and I know what that sounds like. This one doesn't really make any sound except a faintly detectable thud that I can feel with my chair when my MSP takes off from a stand-still. If anyone has any ideas on what it may be, I would greatly appreciate it. Thanks!

[Heathen23]

Anything in the cargo net? Sounds like I'm joking but I'm not. I keep my detailing spray in there and it wacks around.

Also the car is very jumpy if you let off the gas rapidly after running the revs up. My car will buck very easily if I do that creating a bit of a jolting sound.

(dunno)

[omega0021]

Anything in the cargo net? Sounds like I'm joking but I'm not. I keep my detailing spray in there and it wacks around.

Also the car is very jumpy if you let off the gas rapidly after running the revs up. My car will buck very easily if I do that creating a bit of a jolting sound.

(dunno)


I wish it were that easy. My trunk is completely bare. I even removed my emergency kit that contains tools and an extra gallon of coolant. The thud seems to disappear when my fuel tank is not full. When I fill up, the thud returns. Its not loud by any means and its not a clunk at all. However, I can feel it from my seat when I accelerate. It gets annoying. I also checked under my seat to see if anything underneath my seat is making the vibration...nothing. I am wondering if it could be the spare tire, but if so, then why only when my fuel tank is full? Any chance might it be a loose fuel tank?