THERE HAS BEEN A RECALL ON THIS ITEM!
"There is a strong gas smell coming into the passenger compartment. Where is this smell coming from?"
This smell is most likely coming from a cracked one-way safety valve (Saftey Valve Sub-assembly: part #77710-87302-000) located behind the rear quarter panel on the fuel tank filler side of a Daihatsu Feroza / Daihatsu Rocky / Daihatsu Sportrak (picture below). Repair or replace the valve. This should clear up your problem. If not, check for leaks in the hoses and check the fuel pump.
