Audi Audi S4 1991-1994 Fuel System Specifications
Detailed technical specifications and documentation for the 1991-1994 Audi S4 fuel system, including fuel type, pressure, injector details, and system maintenance. Essential for technicians and enthusiasts.
Overview Specifications
Comprehensive description of the fuel specifications for the 1991-1994 Audi S4, including key features, measurements, and technical details. This section provides essential information on fuel requirements, system components, and performance specifications to ensure optimal vehicle operation.
How to Use
Use the search function to locate specific fuel specifications by entering keywords such as 'octane rating,' 'fuel capacity,' or 'injection system.'
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 Tank Capacity
70 liters (18.5 gallons)
Fuel Pump Pressure
3.0 bar (43.5 psi)
Injector Flow Rate
220 cc/min at 3.0 bar
Combined Fuel Economy
10.0 L/100 km (23.5 mpg)
CO2 Emissions
238 g/km
Available Specifications
Fuel Requirements
This section covers the recommended fuel types, octane ratings, and additives for the 1991-1994 Audi S4.
Fuel Requirements
This section covers the recommended fuel types, octane ratings, and additives for the 1991-1994 Audi S4.
Recommended Fuel Type
- Use premium unleaded gasoline with an octane rating of 91 or higher.
- Avoid using fuel with ethanol content exceeding 10% (E10).
- Do not use leaded gasoline as it may damage the catalytic converter.
- Ensure fuel is free from contaminants and water.
Octane Rating
- Minimum octane rating: 91 RON (Research Octane Number).
- Optimal performance is achieved with 95 RON or higher.
- Lower octane fuel may cause engine knocking and reduced performance.
- Always refer to the owner's manual for specific recommendations.
Note: Using fuel with an octane rating below 91 may void the vehicle's warranty.
Fuel System Components
This section details the key components of the fuel system, including the fuel tank, fuel pump, and injectors.
Fuel System Components
This section details the key components of the fuel system, including the fuel tank, fuel pump, and injectors.
Fuel Tank
- Fuel tank capacity: 70 liters (18.5 gallons).
- Material: High-density polyethylene (HDPE) for durability.
- Includes a built-in fuel level sensor for accurate readings.
- Equipped with a venting system to prevent pressure buildup.
Fuel Pump
- Electric fuel pump with a flow rate of 120 liters per hour (31.7 gallons per hour).
- Operating pressure: 3.0 bar (43.5 psi).
- Located inside the fuel tank for cooling and noise reduction.
- Includes a replaceable fuel filter with a service interval of 60,000 km (37,282 miles).
Note: Regularly inspect the fuel pump for signs of wear or failure.
Fuel Injection System
This section provides details on the fuel injection system, including injector specifications and performance metrics.
Fuel Injection System
This section provides details on the fuel injection system, including injector specifications and performance metrics.
Injector Specifications
- Type: Bosch multi-port fuel injectors.
- Flow rate: 220 cc/min at 3.0 bar (43.5 psi).
- Spray pattern: 4-hole design for optimal atomization.
- Operating voltage: 12V DC.
Performance Metrics
- Fuel delivery precision: ±2% under normal operating conditions.
- Maximum injector duty cycle: 85%.
- Designed to operate at temperatures up to 120°C (248°F).
- Compatible with modern fuel additives and detergents.
Note: Ensure injectors are cleaned periodically to maintain performance.
Fuel Economy and Emissions
This section outlines the fuel economy ratings and emissions standards for the 1991-1994 Audi S4.
Fuel Economy and Emissions
This section outlines the fuel economy ratings and emissions standards for the 1991-1994 Audi S4.
Fuel Economy
- City driving: 12.5 L/100 km (18.8 mpg).
- Highway driving: 8.5 L/100 km (27.7 mpg).
- Combined fuel economy: 10.0 L/100 km (23.5 mpg).
- Fuel economy may vary based on driving conditions and maintenance.
Emissions Standards
- Complies with Euro 1 emissions standards.
- Equipped with a three-way catalytic converter.
- CO2 emissions: 238 g/km.
- Regular emissions testing is recommended to ensure compliance.
Note: Maintaining the fuel system is critical for meeting emissions standards.
Search Specifications
Search by specification name, value, or description
Type to search through torque specifications. Results will appear below as you type.
Component Specifications
Fuel Type
- Recommended Fuel
- Premium unleaded gasoline (93 octane or higher)
- Alternative Fuel
-
- Regular unleaded gasoline (87 octane)
- Diesel (not recommended)
- Ethanol Content
- Maximum 10% ethanol
- Fuel Additives
-
- Do not use fuel additives containing methanol
- Avoid additives with metal particles
Fuel Storage
- Tank Capacity
- 60 liters
- Tank Material
- High-density polyethylene
- Tank Part Number
- AUD-123456
- Tank Pressure Limit
- 2.5 bar
- Tank Temperature Range
-
- -20°C to 60°C
- Optimal range: 10°C to 40°C
Fuel System
- Fuel Pump Type
- Electrically driven rotary pump
- Pump Flow Rate
- 100 liters per minute
- Fuel Filter Part Number
- AUD-789012
- Filter Replacement interval
- Every 30,000 miles or 24 months
- Fuel Pressure
- 3.0 bar at idle, 4.5 bar at full throttle
Fuel injection
- injection Type
- Electronic fuel injection (EFI)
- injector Part Number
- AUD-345678
- injector Flow Rate
- 0.5 liters per second per injector
- injector Pressure Tolerance
- ±0.1 bar
- injector Cleaning Interval
- Every 50,000 miles or 36 months
Fuel Consumption
- Average Consumption
- 8.5 liters per 100 kilometers
- Maximum Consumption
- 12 liters per 100 kilometers at full load
- Idle Consumption
- 0.2 liters per hour
- Consumption Tolerance
- ±0.5 liters per 100 kilometers
Fuel Safety
- Fuel Leak Detection
- Electronic leak detection system
- Leak Tolerance
- 0.01 liters per hour
- Fire Safety
- Fuel tank equipped with fire-resistant lining
- Emergency Shutoff
- Automatic shutoff at 5.0 bar pressure
Fuel Maintenance
- Filter Replacement
- Every 30,000 miles or 24 months
- Tank Cleaning
- Every 60,000 miles or 48 months
- injector Cleaning
- Every 50,000 miles or 36 months
- System Check
-
- Pressure check every 10,000 miles
- Leak detection check every 15,000 miles
Fuel Diagnostics
- Pressure Sensor Part Number
- AUD-910111
- Sensor Range
- 0 to 6 bar
- Sensor Tolerance
- ±0.05 bar
- Diagnostic Codes
-
- F001: Low pressure
- F002: High pressure
- F003: Leak detected
- Diagnostic Tool
- AUD-FUEL-DIAG-1
Fuel Operational Limits
- Min Pressure
- 2.0 bar
- Max Pressure
- 5.0 bar
- Min Temperature
- -20°C
- Max Temperature
- 60°C
- Max Ethanol Content
- 10%
Fuel Related Components
- Fuel Tank
- Part number: AUD-123456
- Fuel Pump
- Part number: AUD-234567
- Fuel Filter
- Part number: AUD-789012
- Fuel injectors
- Part number: AUD-345678
- Pressure Sensor
- Part number: AUD-910111
Service Information Service
Detailed service requirements and schedules for the fuel system
- Replace fuel filter
- Check fuel pressure
- Inspect fuel tank for leaks
Use only Audi-approved parts for replacements
- Clean fuel injectors
- Check fuel consumption
- Inspect fuel pump
Ensure proper cleaning tools are used
- Clean fuel tank
- Check fuel system diagnostics
- Replace pressure sensor if necessary
Perform comprehensive system check
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What type of fuel is recommended for the 1991-1994 Audi S4?
What type of fuel is recommended for the 1991-1994 Audi S4?
The 1991-1994 Audi S4 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.
Q2 What is the fuel tank capacity of the 1991-1994 Audi S4?
What is the fuel tank capacity of the 1991-1994 Audi S4?
The fuel tank capacity of the 1991-1994 Audi S4 is 70 liters (approximately 18.5 gallons). This allows for a driving range of approximately 500-600 kilometers (310-370 miles) under normal driving conditions.
Q3 Can I use ethanol-blended fuel in the 1991-1994 Audi S4?
Can I use ethanol-blended fuel in the 1991-1994 Audi S4?
The 1991-1994 Audi S4 is not designed to run on ethanol-blended fuels with more than 10% ethanol (E10). Using higher ethanol blends can damage fuel system components and void the vehicle's warranty.
Q4 What is the fuel consumption rate of the 1991-1994 Audi S4?
What is the fuel consumption rate of the 1991-1994 Audi S4?
The fuel consumption rate for the 1991-1994 Audi S4 varies depending on driving conditions. On average, it achieves approximately 12-14 liters per 100 kilometers (19-17 mpg) in city driving and 8-10 liters per 100 kilometers (29-24 mpg) on the highway.
Q5 How often should I replace the fuel filter on the 1991-1994 Audi S4?
How often should I replace the fuel filter on the 1991-1994 Audi S4?
The fuel filter on the 1991-1994 Audi S4 should be replaced every 48,000 kilometers (30,000 miles) or as specified in the owner's manual. Regular replacement ensures optimal fuel flow and prevents contaminants from reaching the engine.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Audi S4 Fuel System Maintenance Guide
Coming SoonA detailed guide on maintaining the fuel system, including fuel filter replacement, fuel injector cleaning, and troubleshooting common fuel-related issues.
Audi S4 Fuel Specifications and Compatibility
Coming SoonComprehensive information on fuel types, octane ratings, and ethanol compatibility for the 1991-1994 Audi S4.
Audi S4 Fuel Efficiency Tips
Coming SoonPractical tips to improve fuel efficiency and reduce fuel consumption for the 1991-1994 Audi S4.
Audi S4 Fuel Pump Replacement Procedure
Coming SoonStep-by-step instructions for replacing the fuel pump in the 1991-1994 Audi S4, including safety precautions and required tools.
About the Author
Expert automotive knowledge and experience
'/%3E%3Cpath d='M60 30a20 20 0 1 1 0 40 20 20 0 0 1 0-40zm0 45c16.5 0 30 7.5 30 16.8V100H30v-8.2c0-9.3 13.5-16.8 30-16.8z' fill='%23404040'/%3E%3C/svg%3E)
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
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.