noise from gas tank
 

When shifting (manual) clicking sound come from under the car. When
knock to gas tank sound come as fuel pump hitting the bottom, or foreign
object is inside. Does anybody have this weird sound when knock to gas tank?

Re: noise from gas tank
 

Possibly a baffle came loose inside the tank. I saw this on an '01
elantra, I think.

Re: noise from gas tank
 

hyundaitech wrote:
> Possibly a baffle came loose inside the tank. I saw this on an '01
> elantra, I think.
>
What does it take to fix it? Can it be done without dropping a gas tank?

Re: noise from gas tank
 

To repair properly, you'd need to replace the gas tank if a baffle has
broken loose.

It's possible, however, if the piece is small enough, to pull it out the
fuel pump opening in the top of the tank. There's an access cover for the
fuel pump under the rear seat.

Re: noise from gas tank
 

hyundaitech wrote:
> To repair properly, you'd need to replace the gas tank if a baffle has
> broken loose.
>
> It's possible, however, if the piece is small enough, to pull it out the
> fuel pump opening in the top of the tank. There's an access cover for the
> fuel pump under the rear seat.
>
What is the danger to leave as is? Can spark start and blow up the car?
It appear from the sound that one site is loose and other is still
intack creating resonanting/vibrating sound when bang to it.

Re: noise from gas tank
 

I'd not even thought about the sparking issue. I suppose it's possible but
very unlikely. Probably the largest issue would be getting caught on your
float and causing an incorrect fuel reading.

Re: noise from gas tank
 

hyundaitech wrote:

> I'd not even thought about the sparking issue. I suppose it's possible but
> very unlikely. Probably the largest issue would be getting caught on your
> float and causing an incorrect fuel reading.
>

Right. Sparking would not be an issue. The vapor in the
tank is way, way below the explosive limit. That's why electric
fuel senders (and pumps) can be put in the tank with no worries.

Speedy Jim
http://www.nls.net/mp/volks/

Re: noise from gas tank
 

Speedy Jim wrote:
> hyundaitech wrote:
>
>> I'd not even thought about the sparking issue. I suppose it's
>> possible but
>> very unlikely. Probably the largest issue would be getting caught on
>> your
>> float and causing an incorrect fuel reading.
>>
>
> Right. Sparking would not be an issue. The vapor in the
> tank is way, way below the explosive limit. That's why electric
> fuel senders (and pumps) can be put in the tank with no worries.
>
> Speedy Jim
> http://www.nls.net/mp/volks/

Thank you all for your reply; it is very comforting to have such a
quality support on line.
As I mentioned from sound of it, it is more like musical instrument
resonating - as you suggested one site from baffle is loose, making
metal-to-metal vibrating sound when rapid vehicle change. I will
therefore wait for next wormer day and try to fish it out through fuel
pump opening. (or break of mentioned baffle) If unsuccessful, I will
leave situations to observe further. Gas tank replacement seems
premature at this point.
Thanks again all.