Don’t Ignore That Petrol Smell in Your Car After Refuelling

(JUBA) – Ronald, a Toyota Raum owner in Gudele, recently raised an important concern that resonates with many car owners: the persistent smell of petrol inside the car cabin after refuelling.

Though no visible leaks were found, the problem is a serious one, indicating that fuel vapour is escaping from somewhere it shouldn’t. Experts say this could pose a major safety risk if not addressed promptly.

Most modern vehicles, including the Toyota Raum, are equipped with an Evaporative Emission Control System (EVAP), a technology designed to trap fuel vapours and prevent them from leaking into the environment. When parts of this system fail, such as the charcoal canister, purge valve, or vapour hoses, petrol fumes can escape and enter the cabin, especially after a refill.

This issue becomes even more common in vehicles over ten years old, which dominate much of South Sudan’s second hand car market. In environments like Juba where dusty roads and poor servicing habits are common, the charcoal canister can easily clog or crack. Once that happens, the EVAP system fails to trap the fumes properly, especially when the fuel tank is full and pressure builds up.

Another potential culprit is the fuel filler cap. If the rubber gasket around the cap wears out or the cap doesn’t tighten securely, vapours can escape from the filler neck area. Though this may seem minor, it is a common source of fumes in older cars. Trying out a new cap, a relatively cheap fix, can sometimes resolve the problem entirely.

Even without liquid fuel visibly leaking, cracked rubber fuel lines or ageing injector seals may allow fumes to leak slowly. As the engine heats up during driving, these fumes can get drawn into the ventilation system or enter through small holes in the firewall.

It is no coincidence that drivers like Ronald notice the smell a few minutes into their drive, rather than immediately upon starting the car.

Rust is another factor not to overlook. In cities like ours where cars are often parked outdoors and face seasonal rains, corrosion around the seams of the fuel tank or hose connectors can cause vapour leaks. Although you may not see any puddles under the car, small amounts of vapour escaping from a rusty area could still pose a significant fire hazard.

Depending on the model of your car, the fuel tank may sit directly beneath the boot or rear seat. If the seal between the tank and cabin is broken or worn out, especially in bumpy areas, fumes can seep inside easily.

Some owners unknowingly worsen the problem by overfilling their tanks, ignoring the first automatic click of the fuel pump. Overfilling floods the EVAP system, which then releases vapours into the cabin for several days. Using low quality fuel, a common issue due to limited regulation of roadside fuel vendors, may also accelerate wear and tear on these systems.

If your vehicle begins emitting a strong fuel smell, mechanics advise parking the car immediately. Fuel vapours are flammable, and even a small electrical spark can result in a fire. A thorough inspection should be carried out, checking the EVAP system, fuel cap, injectors, fuel tank and all hoses. Mechanics should also examine under the car with a torch for damp spots or fuel mist.

These issues are especially relevant in South Sudan where most vehicles are imported second-hand from Japan or the UAE, and maintenance history is often unknown. Cars are not immune to age related faults.