My BMW Smells Like Gas: 9 Common Causes

With rising fuel prices, motorists want to squeeze as many miles per gallon as possible. We quickly notice lower gas mileage during these trying times. Couple that with a vehicle that smells like gas, and alarm bells go off. Studies show that gas leaks are one of the leading causes of vehicle fires. While a BMW fuel leak is pretty common, immediately scheduling a fuel system service is still vital. A detailed inspection of your vehicle’s fuel system, fuel tank, gas cap, and spark plugs should identify why your BMW smells like gas.

9 Common Causes

These are a few common causes of a BMW fuel leak. It is important to schedule a service appointment to diagnose and repair these fuel system issues immediately. Leaking fuel and fumes can be dangerous and lead to expensive repairs if left unaddressed. Smelling those toxic fumes may also trigger headaches, nausea, and lasting brain damage. Be safe and get your BMW diagnosed by a qualified technician when your BMW smells like gas

1) Damaged Fuel Tank

Your BMW fuel tank is either plastic or metal. Its primary function is securely holding the fuel that powers your combustion engine. A compromised fuel tank generates wet spots under your car that smell like gas. There are several reasons a fuel tank leaks.

Corrosion:  

• Road salt. If you drive in areas that use road salt during the winter, wash your vehicle’s undercarriage often to prevent gas tank damage. 
• Excessive moisture on the top of your gas tank can cause rust or weakened areas, resulting in cracks. 

Punctures: 

• While less common, road debris and auto collisions can dent or puncture fuel tanks. 

Fuel and vapors leak out of the tiniest cracks and are sucked into the fresh air intake, causing your interior to smell like gas. An auto technician can sometimes repair fuel tank holes, but they usually recommend replacing the tank. Get a qualified technician to inspect your vehicle and advise you on the best solution.

2) Exhaust Leak

An exhaust leak often presents itself with a louder-than-usual exhaust sound, especially when accelerating. A light tapping or ticking sound may also occur. If the gas smells particularly strong, look for the leak before the catalytic converter. If you suspect an exhaust leak, have a certified mechanic perform a detailed inspection.

3) Faulty Canister

The canister is part of the emission control system and contains charcoal. It filters excessive fuel vapors before they travel out of the exhaust. When the canister is cracked or damaged, it often triggers a Check Engine Light on your dash. It is always a good idea to get the diagnostic trouble code checked when your dash lights up.

4) Fuel Injector Seals

The fuel injectors in your BMW have rubber O-rings or seals that can dry out and crack. When damaged, they allow fuel and fumes to leak. Leaks can be seen and smelled around the injectors under your hood.

5) Fuel Line Leak

If your fuel line leaks, you will likely experience a strong gas smell and obvious signs of dripping fuel under your car. Since rubber fuel lines are unprotected from road debris, they are a common source of fuel leaks.

6) Fuel Pump Leak

A leaking or failing fuel pump will make your BMW challenging to drive. The pump sends the pressurized fuel to the injectors and then sprays the fuel into the engine. A failing pump won’t provide a consistent fuel supply, causing poor engine performance. A leaking pump will also create a strong gas smell.

7) Leaking Gas Cap

The gas cap has an essential gasket or O-ring under the cap. Fuel and fumes leak when this gasket gets worn or damaged. The plastic cap can also degrade and crack over time, allowing fumes to escape. A bad gas cap can also interfere with the fuel system pressure, triggering a Check Engine Light. Replacing the gasket or cap is usually a simple and inexpensive repair you can do yourself.

8) Loose or Damaged Spark Plugs

Spark plugs have sealing washers that prevent fumes from escaping the combustion chamber. Damaged washers and improperly torqued spark plugs often cause fumes to leak into the fresh air intake, which can cause your BMW to smell like gas.

9) Manufacturer Recalls for Fuel Leaks

The National Highway Traffic Safety Administration (NHTSA) states that BMW has recalled over 130,000 vehicles in the USA for fuel leaks. Additionally, certain 2007–2012 BMW models have fuel pumps with faulty wiring that can make your BMW smell like gas. 

If you suspect your BMW is part of these recalls, check here or schedule an auto service with a qualified technician to diagnose and repair your vehicle.

BMW Service in Kirkland, WA

Fisher’s Auto Service, Inc. provides expert BMW repair and maintenance to the Kirkland, WA, area. We have an established reputation for honesty with fair pricing and high-quality service. We stand behind our work and guarantee our BMW repair and maintenance services. Our certified technicians constantly surpass our customers’ expectations.

Schedule BMW Smells Like Gas Service Today

Call our office at (425)441-3626 or visit our website to schedule a BMW Smells Like Gas service appointment today. Let our certified BMW technicians inspect your car’s Fuel System, Fuel Tank, Gas Cap, and Spark Plugs to get your vehicle safely back on the road.