Loud humming noise coming inside the cabin
 

Hello,
I am having issues with my 98 Honda Civic ex, its an auto 1.6l. The problem is when i drive the car there is a loud humming noise coming within the cabin, iam not too sure, where to start looking, any help would be greatly appreciated.
thanks

It just may be the fuel pump, because it is right under the backseat and a small access door is all thats between the cabin and the fuel pump.