BMW 745i 2002-2009

BMW 745i 2002-2009 Fuel System Specifications

Detailed technical guide for the 2002-2009 BMW 745i fuel system, covering fuel type, pressure, injector and pump specifications, and maintenance procedures. Essential for technicians and BMW enthusiasts.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the fuel specifications for the 2002-2009 BMW 745i, including key features, measurements, and technical details.

How to Use

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

Navigate through the fuel documentation sections using the table of contents or by scrolling through the document. Each section is clearly labeled for easy access.

Key Specifications

Fuel Type

Premium unleaded (91 AKI)

Fuel Tank Capacity

22.5 gallons (85 liters)

Fuel Pump Pressure

58 psi (400 kPa)

Fuel Injector Flow Rate

210 cc/min at 43.5 psi (300 kPa)

Combined Fuel Economy

18 mpg (7.6 km/L)

Available Specifications

Fuel Requirements

This section covers the fuel type, octane rating, and additives recommended for the BMW 745i.

Fuel Type and Octane Rating

Premium unleaded gasoline with a minimum octane rating of 91 AKI (Anti-Knock Index)
Do not use gasoline with an octane rating below 89 AKI to avoid engine knocking
Ethanol blends up to 10% (E10) are acceptable
Avoid using gasoline with methanol content
Use of fuel additives is not required but may be used for cleaning purposes

Fuel Additives

BMW recommends using only approved fuel additives
Additives should not contain metallic compounds
Use of additives with detergents can help maintain fuel injector cleanliness
Avoid additives that increase ethanol content beyond 10%
Always follow the manufacturer's instructions when using additives

Note: Using unapproved additives may void the vehicle's warranty.

Fuel System Specifications

This section provides detailed information on the fuel system components, including the fuel tank, fuel pump, and injectors.

Fuel Tank Capacity

Total fuel tank capacity: 22.5 gallons (85 liters)
Reserve fuel capacity: 2.5 gallons (9.5 liters)
Fuel tank material: High-density polyethylene (HDPE)
Fuel tank design: Dual-chamber for improved safety and efficiency
Fuel tank pressure: Maintained at 3.5 psi (24 kPa) for vapor control

Fuel Pump and Injectors

Electric fuel pump pressure: 58 psi (400 kPa)
Fuel injector flow rate: 210 cc/min at 43.5 psi (300 kPa)
Injector type: Bosch high-pressure direct injection
Fuel filter replacement interval: Every 30,000 miles (48,000 km)
Fuel system operating temperature: -40°F to 140°F (-40°C to 60°C)

Note: Regular maintenance of the fuel system is crucial for optimal performance.

Fuel Consumption and Efficiency

This section outlines the fuel consumption rates and efficiency metrics for the BMW 745i.

Fuel Economy

City driving: 15 mpg (6.4 km/L)
Highway driving: 23 mpg (9.8 km/L)
Combined fuel economy: 18 mpg (7.6 km/L)
CO2 emissions: 330 g/km
Fuel consumption rate: 5.5 L/100 km at 60 mph (96.5 km/h)

Efficiency Enhancements

Variable valve timing (VANOS) for improved fuel efficiency
Lightweight engine components to reduce fuel consumption
Aerodynamic design for reduced drag
Start-stop technology for reduced idling fuel consumption
Energy recuperation system for improved efficiency

Note: Driving habits and conditions significantly impact fuel efficiency.

Fuel System Maintenance

This section provides guidelines for maintaining the fuel system to ensure longevity and performance.

Routine Maintenance

Inspect fuel lines and connections every 15,000 miles (24,000 km)
Replace fuel filter every 30,000 miles (48,000 km)
Check fuel injectors for clogs or leaks during service intervals
Monitor fuel pressure regularly using diagnostic tools
Clean fuel tank filler neck and cap to prevent contamination

Troubleshooting Common Issues

Engine misfires may indicate clogged fuel injectors
Reduced fuel pressure could signal a failing fuel pump
Fuel odor inside the cabin may indicate a leak in the fuel system
Poor fuel economy may be caused by a dirty air filter or faulty oxygen sensor
Check engine light may illuminate due to fuel system-related faults

Note: Always use BMW-approved diagnostic tools for troubleshooting.

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) with reduced performance

Ethanol Content: Maximum 10% ethanol (E10)

Octane Rating: 91 AKI (Anti-Knock Index) or higher

Notes: Using lower octane fuel may cause engine knocking and reduced performance

Fuel Tank

Capacity: 22.5 gallons (85 liters)

Material: High-density polyethylene (HDPE)

Part Number: 16117183875

Pressure Sensor: Part Number: 16141180425
Operating Pressure: 3.5 - 4.5 psi (24 - 31 kPa)

Notes: Fuel tank includes an integrated fuel pump and level sensor

Fuel Pump

Type: Electric in-tank fuel pump

Part Number: 16146757299

Flow Rate: 120 liters per hour (LPH) at 5 bar

Operating Voltage: 12V DC

Pressure: 5 bar (72.5 psi)

Notes: Fuel pump includes a built-in fuel filter

Fuel Filter

Type: In-line fuel filter

Part Number: 13327541727

Micron Rating: 10 microns

Replacement interval: Every 30,000 miles or 24 months

Notes: Located under the vehicle near the fuel tank

Fuel injectors

Type: Solenoid-operated multi-hole injectors

Part Number: 13537585255

Flow Rate: 200 cc/min at 3 bar

Operating Pressure: 3.5 - 4.5 bar (50.8 - 65.3 psi)

Spray Pattern: Multi-hole conical spray

Notes: Injectors are controlled by the DME (Digital Motor Electronics) system

Fuel Pressure Regulator

Type: Mechanical diaphragm regulator

Part Number: 13537585256

Operating Pressure: 3.5 - 4.5 bar (50.8 - 65.3 psi)

Location: Integrated into the fuel rail

Notes: Maintains consistent fuel pressure to the injectors

Fuel Rail

Material: Aluminum

Part Number: 13537585257

Pressure Rating: 6 bar (87 psi)

Notes: Fuel rail distributes fuel to the injectors and houses the pressure regulator

Fuel System Diagnostics

Diagnostic Tool: BMW DIS (Diagnostic Information System) or ISTA (Integrated Service Technical Application)

Error Codes

P0171 - System too lean
P0172 - System too rich
P0190 - Fuel rail pressure sensor circuit malfunction
P0191 - Fuel rail pressure sensor range/performance
P0192 - Fuel rail pressure sensor circuit low input

Notes: Diagnostic codes can be read using the OBD-II port under the dashboard

Fuel System Maintenance

inspection Interval: Every 15,000 miles or 12 months

Maintenance Items

Inspect fuel lines for leaks or damage
Check fuel pump operation
Replace fuel filter as needed
Inspect fuel injectors for clogging or leaks

Notes: Regular maintenance ensures optimal fuel system performance and longevity

Fuel System Safety

Fire Hazard: Fuel is highly flammable; avoid open flames or sparks

Pressure Warning: Fuel system operates under high pressure; depressurize before servicing

Safety Equipment

Fire extinguisher
Safety goggles
Gloves

Notes: Always disconnect the battery before working on the fuel system

Service Information Service

Detailed service requirements and schedules for the fuel system

15,000 miles

12 months

Inspect fuel lines and connections
Check fuel pump operation
Inspect fuel injectors

Regular inspection ensures fuel system integrity

30,000 miles

24 months

Replace fuel filter
Inspect fuel tank for damage or leaks
Check fuel pressure regulator

Replacement intervals may vary based on driving conditions

60,000 miles

48 months

Replace fuel pump if necessary
Inspect and clean fuel injectors
Check fuel rail for leaks or damage

Perform comprehensive fuel system inspection and maintenance

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of fuel is recommended for the 2002-2009 BMW 745i?

The 2002-2009 BMW 745i requires premium unleaded gasoline with an octane rating of 91 or higher. Using lower octane fuel may result in reduced performance and potential engine knocking.

What is the fuel tank capacity of the BMW 745i?

The fuel tank capacity of the 2002-2009 BMW 745i is 22.5 gallons (85 liters). This allows for extended driving ranges between refueling.

Can I use ethanol-blended fuel in my BMW 745i?

The BMW 745i can safely use ethanol-blended fuels with up to 10% ethanol (E10). However, fuels with higher ethanol concentrations (e.g., E15 or E85) are not recommended as they can damage the fuel system and void the warranty.

What is the fuel consumption rate for the BMW 745i?

The 2002-2009 BMW 745i has an average fuel consumption of approximately 15 mpg in the city and 23 mpg on the highway, depending on driving conditions and maintenance.

How often should I replace the fuel filter on my BMW 745i?

The fuel filter on the BMW 745i should be replaced every 30,000 to 50,000 miles or as specified in the vehicle's maintenance schedule. A clogged fuel filter can lead to poor engine performance and fuel delivery issues.

What should I do if I accidentally use the wrong type of fuel?

If you accidentally use diesel or a fuel with an octane rating below 91, do not start the engine. Contact a BMW-certified technician immediately to drain and flush the fuel system to prevent damage.

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 745i Owner's Manual

Coming Soon

The official owner's manual provides detailed information on fuel specifications, maintenance schedules, and safety precautions.

Fuel System Maintenance Guide

Coming Soon

A comprehensive guide to maintaining the fuel system, including fuel filter replacement and injector cleaning procedures.

BMW Fuel Additives Recommendations

Coming Soon

Learn about BMW-approved fuel additives that can enhance performance and protect the fuel system.

Troubleshooting Fuel Delivery Issues

Coming Soon

Step-by-step instructions for diagnosing and resolving common fuel delivery problems in the BMW 745i.

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