my BMW 3 Series E90/E91 (2005-2012) has a strong gas smell, what should I check?

Solution

1. Preparation

• Gather tools: socket set, screwdriver set, fuel pressure gauge, safety goggles, and gloves.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect Fuel Lines

• Remove any necessary undercarriage covers to access the fuel lines.
• Visually inspect all fuel lines from the tank to the engine for cracks or leaks.
• If any damage is found, proceed to replace the affected sections of the fuel line.

3. Check Fuel Injectors

• Disconnect the electrical connector from each fuel injector.
• Inspect the injector seals for wear or damage.
• If leaks are detected, replace the faulty injectors with new ones.

4. Examine Fuel Tank

• Safely lift the vehicle using jack stands to access the fuel tank.
• Inspect the fuel tank for signs of rust, corrosion, or physical damage.
• If a leak is present, replace the fuel tank as necessary.

5. Test Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on without starting the engine to check the pressure reading.
• If the pressure is outside the manufacturer's specifications, investigate the fuel pump and regulator.

6. Inspect Fuel Cap

• Remove the fuel cap and inspect the rubber seal for wear and tear.
• Replace the fuel cap if the seal is damaged or if it does not create a tight seal.