petrol smell while driving and while stoped and engine runing

Sounds like you have a leak somewhere you can add some fuel dye and get a dye light and find the leak that way.

i showed my car to garage they told to change fuel filter and check.Should i change fuel filter?

So they said the fuel filter was leaking?

they just told to change fuel filter and check and still it smells then it might be a leak.SO is fuel filter like a air filter??

Yes all the fuel filter filters the fuel coming from the take like the air filter filters the air coming into the engine.If it smells like a leak unless the fuel filter is leaking then i dint know how replacing it would stop that smell.I would try out the fuel dye and the light.

my car the fuel tank is behind so i got a air filter type.Is that call fuel filter?

Does the filter hook to the pressure line coming off the fuel tank?

yea because its like a air filter in the fuel tank where all fuel pipes r there. so tht is tht fuel filter?

I have no info on your car because its a european model i only have info on cars sold in the usa.But iam still trying to help you here.Do you have a pic of what your talking about?