If your vehicle is showing raw gasoline smell near the back of the car, here are the most likely causes and the parts you'll need to fix each one.
A loose, missing, or worn-out gas cap allows raw fuel vapors to escape directly from the filler neck. This is the most frequent cause of fuel smells near the rear of the vehicle and often triggers an EVAP-related Check Engine Light.
If the fuel pump was recently replaced, the lock ring or rubber O-ring gasket at the top of the gas tank may not be seated correctly. This allows raw fuel to slosh out and pool on top of the tank, especially when the tank is full.
The metal pipe or rubber hose connecting the gas cap to the fuel tank can rust or crack over time. This leaks fuel vapors or liquid gas, usually noticed most during or right after filling up at the gas station.
The evaporative emissions (EVAP) system captures fuel vapors in a charcoal canister, often located near the rear bumper or gas tank. A cracked canister, saturated charcoal, or a stuck vent valve will vent raw gas smells directly into the air.
In areas with heavy winter road salt, metal fuel tanks can rust and develop pinhole leaks. Road debris can also puncture plastic tanks, leading to a constant, dangerous drip of raw gasoline.