Why Does My Car Smell Like Petrol?

At a Glance

A strong smell of petrol around your car is never something to ignore. While it could be as simple as a loose fuel cap, it can also be a sign of a fuel leak or another issue within the fuel system. Dealing with the problem early can help prevent more expensive repairs and, more importantly, keep you safe.

Why Does My Car Smell Like Petrol?

A faint smell immediately after refuelling is usually nothing to worry about, especially if you’ve accidentally spilled a few drops around the filler cap. But if the smell keeps coming back or seems stronger than usual, your car could be trying to tell you that something isn’t quite right.

Sometimes the cause is quick and inexpensive to fix. Other times, it needs investigating sooner rather than later to avoid bigger problems developing.

Loose or Damaged Fuel Cap

Your fuel cap creates a seal that prevents petrol vapours from escaping from the fuel tank. If it hasn’t been tightened properly after filling up, or if the rubber seal has become worn over time, you may start noticing the smell of petrol around the back of the vehicle.

This is always worth checking first.

Sometimes all it takes to solve the problem is tightening the fuel cap.

If the seal has cracked or perished, replacing the cap is usually straightforward and inexpensive.

Fuel Leaks

If the smell is stronger than usual or seems to appear every time you drive, a fuel leak could be the cause.

Modern fuel systems are designed to be completely sealed, so petrol shouldn’t be escaping anywhere.

Leaks can develop from:

• Fuel pipes
• Flexible fuel hoses
• Fuel injectors
• Connections around the fuel tank

In some cases, you might even notice small patches of fuel underneath the vehicle after it’s been parked.

Even a small leak should never be ignored. Petrol is highly flammable, and what starts as a minor leak can quickly become a much more serious safety issue.

Faulty Fuel Injectors

The role of fuel injectors is to deliver the exact amount of fuel your engine needs.

Over time, they can become worn or develop leaking seals, allowing small amounts of petrol to escape before they reach the engine.

You may also notice:

• Rough engine running
• Reduced fuel economy
• Difficulty starting the engine
• A noticeable petrol smell around the engine bay

Injector problems don’t always develop overnight.

Often the symptoms become gradually worse over time, making them easy to overlook until the smell becomes impossible to ignore.

Problems With the EVAP System

An EVAP System’s job is to capture petrol vapours and stop them escaping into the atmosphere.

If part of this system develops a fault, those vapours can escape instead, creating a noticeable petrol smell without there being an obvious fuel leak.

In many cases, everything else about the car seems completely normal.

You may not notice any changes to the way it drives at all.

Sometimes the only clue is the smell itself, while other vehicles may also illuminate the check engine warning light.

Running Rich

Sometimes the issue isn’t a leak at all.

Your engine may simply be using more fuel than it should.

This is known as running rich, where too much fuel enters the engine compared to the amount of air.

When that happens, some fuel isn’t fully burned during combustion, which can create a noticeable petrol smell.

You might also notice:

• Poor fuel economy
• Slower acceleration
• Black exhaust smoke
• A check engine warning light

Several different faults can cause an engine to run rich, so identifying the exact cause usually requires further investigation.

Petrol Smell Inside the Cabin

If the smell is strongest inside the car, it’s worth taking seriously.

You may notice it more when:

• The heater is switched on
• The air conditioning is running
• You’re sitting in slow-moving traffic
• The windows are closed

Even if the smell comes and goes, it’s always worth finding out what’s causing it rather than simply masking it by opening the windows.

Is It Safe to Keep Driving?

That depends entirely on what’s causing the smell.

While serious incidents are rare, petrol is highly flammable, so it’s always better to err on the side of caution.

If you’re in any doubt, having the vehicle inspected is the safest option.

When Should You Get It Checked?

Getting the problem diagnosed early can help prevent:

• Reduced fuel economy
• Poor engine performance
• More expensive repairs
• Safety risks

Catching the issue early is usually quicker, simpler and far less costly than waiting for it to become something more serious.

For Petrol Smell Diagnosis, Contact In Town Automotive

While a petrol smell may be caused by something simple, it’s always worth finding out exactly what’s behind the smell before it develops into a bigger problem.

At In Town Automotive, our experienced technicians can quickly identify the source using professional diagnostic equipment and thorough vehicle inspections. Whether it’s a loose fuel cap, a leaking fuel line, faulty injectors or an EVAP system fault, we’ll pinpoint the problem and recommend the right repair.

Get in touch with In Town Automotive today to book an inspection and let us help keep your car safe, reliable and running as it should.