BMW 840i 2018-present

BMW 840i 2018-present Fuel System Specifications

Comprehensive technical specifications for the fuel system of the 2018-Present BMW 840i, including fuel type, fuel delivery system, and emission compliance. Ideal for technicians and enthusiasts.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the fuel specifications for the 2018-Present BMW 840i, including key features, measurements, and technical details. This section provides essential information on fuel requirements, system components, and performance metrics.

How to Use

Use the search function to locate specific fuel specifications by entering keywords such as 'octane rating', 'fuel tank capacity', or 'fuel injection system'.

Navigate through the fuel documentation sections using the table of contents or by scrolling through the document. Each section is labeled with a clear title and includes detailed subsections.

Key Specifications

Fuel Type

Premium unleaded gasoline (91-93 AKI)

Fuel Tank Capacity

68 liters (18 gallons)

Fuel Injection Pressure

Up to 200 bar (2900 psi)

CO2 Emissions

214 g/km

Combined Fuel Economy

9.4 L/100 km (25 mpg)

Available Specifications

Fuel Requirements

This section outlines the fuel type, octane rating, and additives recommended for optimal performance of the BMW 840i.

Fuel Type and Octane Rating

Premium unleaded gasoline with a minimum octane rating of 91 AKI (Anti-Knock Index)
Recommended octane rating of 93 AKI for enhanced performance
Use of ethanol blends up to 10% (E10) is acceptable
Avoid using diesel or lower-octane fuels to prevent engine damage

Fuel Additives

BMW-approved fuel additives are recommended for maintaining fuel system cleanliness
Avoid using aftermarket additives not approved by BMW
Additives should not contain metallic compounds or manganese-based substances
Regular use of additives can help prevent carbon buildup in the engine

Note: Using non-approved additives may void the vehicle's warranty.

Fuel System Components

This section details the key components of the BMW 840i's fuel system, including the fuel tank, fuel pump, and injection system.

Fuel Tank and Capacity

Fuel tank capacity: 68 liters (18 gallons)
Material: High-density polyethylene for durability and corrosion resistance
Includes a fuel level sensor for accurate fuel gauge readings
Designed to minimize fuel sloshing and evaporation

Fuel Injection System

Direct fuel injection system with high-pressure injectors
Injection pressure: Up to 200 bar (2900 psi)
Precision-controlled fuel delivery for optimal combustion
Supports stratified charge operation for improved efficiency

Note: The direct injection system requires regular maintenance to prevent carbon deposits on intake valves.

Fuel Efficiency and Emissions

This section covers the fuel efficiency ratings and emissions standards for the BMW 840i.

Fuel Efficiency

Combined fuel economy: 9.4 L/100 km (25 mpg)
Highway fuel economy: 7.1 L/100 km (33 mpg)
City fuel economy: 12.4 L/100 km (19 mpg)
EfficientDynamics technology optimizes fuel consumption

Emissions Standards

Complies with Euro 6d-TEMP emissions standards
Equipped with a particulate filter for reduced particulate emissions
NOx emissions: Less than 60 mg/km
CO2 emissions: 214 g/km

Note: Regular maintenance of the emissions system is required to ensure compliance with environmental regulations.

Search Specifications

Search by specification name, value, or description

Component Specifications

Fuel Type

Recommended Fuel: Premium unleaded gasoline (91 AKI or 95 RON minimum)

Alternative Fuel: Regular unleaded gasoline (87 AKI or 91 RON minimum) with reduced performance

Ethanol Content: Maximum 10% ethanol (E10)

Octane Rating: Minimum: 91 AKI (95 RON)
Recommended: 93 AKI (98 RON)

Fuel System

Fuel Delivery: Direct injection

Fuel Pump Pressure: 200-500 psi (13.8-34.5 bar)

Fuel Filter Part Number: 13-32-7-844-123

Fuel injector Part Number: 13-62-7-844-456

Fuel Tank Capacity: 18.0 gallons (68.1 liters)

Fuel Quality

Sulfur Content: Maximum 10 ppm

Additives: BMW-approved fuel additives recommended

Contamination Tolerance: Maximum 0.5% water content

Storage Life: Up to 6 months in sealed containers

Fuel Economy

City: 20 mpg (11.8 L/100 km)

Highway: 29 mpg (8.1 L/100 km)

Combined: 23 mpg (10.2 L/100 km)

Co2 Emissions: 220 g/km

Fuel Pressure Specifications

Idle Pressure: 50-60 psi (3.4-4.1 bar)

Full Load Pressure: 200-220 psi (13.8-15.2 bar)

Tolerance: +/- 5 psi (0.3 bar)

Fuel System Maintenance

Fuel Filter Replacement interval: Every 30,000 miles (48,000 km) or 24 months

Fuel injector Cleaning Interval: Every 60,000 miles (96,000 km) or 48 months

Fuel Tank Cleaning Interval: As needed, based on contamination

Fuel System Diagnostics

Diagnostic Trouble Codes

P0171
P0172
P0174
P0175

Diagnostic Tool: BMW ISTA or compatible OBD-II scanner

Fuel Pressure Sensor Part Number: 13-62-7-844-789

Fuel Level Sensor Part Number: 16-14-7-844-321

Fuel System Safety

Fire Hazard Warning: Avoid open flames or sparks near fuel system components

Fuel Line Pressure Relief: Depressurize system before servicing

Fuel Spill Cleanup: Use absorbent materials and dispose of properly

Fuel System Cross References

Related Components

High-pressure fuel pump
Low-pressure fuel pump
Fuel rail
Fuel pressure regulator

Part Numbers: High Pressure Fuel Pump: 13-51-7-844-654
Low Pressure Fuel Pump: 16-14-7-844-987
Fuel Rail: 13-31-7-844-321
Fuel Pressure Regulator: 13-51-7-844-123

Fuel System Operational Limits

Maximum Fuel Temperature: 140°F (60°C)

Minimum Fuel Temperature: -40°F (-40°C)

Maximum Fuel Pressure: 500 psi (34.5 bar)

Minimum Fuel Pressure: 30 psi (2.1 bar)

Service Information Service

Detailed service requirements and schedules for the fuel system

30,000 miles

24 months

Replace fuel filter
Inspect fuel lines for leaks
Check fuel pressure

Use BMW-approved parts and fluids

60,000 miles

48 months

Clean fuel injectors
Inspect fuel pump performance
Check fuel tank for contamination

Perform diagnostic scan for fuel system codes

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of fuel is recommended for the 2018-Present BMW 840i?

The BMW 840i requires premium unleaded gasoline with an octane rating of 91 AKI (95 RON) or higher. Using lower octane fuel may result in reduced performance and efficiency.

What is the fuel tank capacity of the BMW 840i?

The fuel tank capacity of the BMW 840i is 18.0 gallons (68 liters). This allows for an estimated range of approximately 450-500 miles depending on driving conditions.

Can I use ethanol-blended fuel in the BMW 840i?

Yes, the BMW 840i is compatible with ethanol-blended fuels containing up to 10% ethanol (E10). However, fuels with higher ethanol content (e.g., E15 or E85) are not recommended as they may cause engine damage and void the warranty.

What is the fuel economy of the BMW 840i?

The BMW 840i achieves an EPA-estimated fuel economy of 23 MPG in the city, 30 MPG on the highway, and 26 MPG combined. Actual mileage may vary based on driving habits and conditions.

Does the BMW 840i require any fuel additives?

No, the BMW 840i does not require additional fuel additives. The engine is designed to operate efficiently with high-quality fuel. Using additives may interfere with the engine management system and is not recommended.

What happens if I accidentally use diesel fuel in the BMW 840i?

Using diesel fuel in the BMW 840i, which is designed for gasoline, can cause severe engine damage. If this occurs, do not start the engine. Contact a BMW-certified technician immediately to drain and flush the fuel system.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

BMW Fuel System Overview

Coming Soon

Detailed guide on the fuel system components, operation, and maintenance for the BMW 840i.

Fuel Quality and Performance

Coming Soon

Learn how fuel quality impacts the performance and longevity of your BMW 840i's engine.

Fuel Efficiency Tips

Coming Soon

Practical tips to maximize fuel efficiency and reduce emissions for your BMW 840i.

BMW Warranty and Fuel Use

Coming Soon

Understand how using improper fuel can affect your BMW 840i's warranty coverage.

About the Author

Expert automotive knowledge and experience

ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

Facebook Contact

15+ Years

Experience

500+ Guides

Guides

50+ Makes

Vehicles

1000+ Solutions

Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

ASE Master Technician Certification
Advanced Diagnostic Specialist
Hybrid/Electric Vehicle Systems
Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information

The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.

Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information

All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
Vehicle specifications and procedures may vary by model year, trim level, and region.
Always follow the manufacturer's recommended procedures and safety precautions.
Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
If you're unsure about any procedure, consult a qualified professional mechanic.

Intellectual Property

All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.