Audi Audi S3 1999-2003

Audi Audi S3 1999-2003 Fuel System Specifications

Detailed technical specifications and documentation for the fuel system of the 1999-2003 Audi S3, including fuel type requirements, fuel pressure, injector flow rates, and system components.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the fuel specifications for the 1999-2003 Audi S3, including key features, measurements, and technical details. This section provides essential information on fuel requirements, system components, and performance specifications to ensure optimal operation and maintenance of the vehicle.

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 structured headings. Each section is labeled for easy access to relevant information.

Key Specifications

Fuel Type

Premium unleaded (95 RON min)

Fuel Capacity

55 liters (14.5 gallons)

Fuel Pressure

3.8 bar (55 psi)

Injector Flow Rate

200 cc/min at 3 bar

CO2 Emissions

210 g/km

Available Specifications

Fuel Requirements

This section outlines the fuel type, octane rating, and additives recommended for the 1999-2003 Audi S3 to ensure optimal engine performance and longevity.

Fuel Type and Octane Rating

Recommended fuel type: Premium unleaded gasoline (95 RON minimum)
Minimum octane rating: 95 RON (91 AKI)
Higher octane fuel (98 RON) recommended for improved performance
Avoid using leaded gasoline or diesel fuel
Ethanol content should not exceed 10% (E10)

Fuel Additives

Use only Audi-approved fuel additives
Avoid aftermarket additives containing silicone or metallic compounds
Additives should not exceed manufacturer-recommended concentrations
Regular use of fuel system cleaners is recommended to prevent deposits

Note: Using non-approved additives 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, injectors, and pressure regulator, along with their specifications and functions.

Fuel Tank and Capacity

Fuel tank material: High-density polyethylene (HDPE)
Total fuel capacity: 55 liters (14.5 gallons)
Reserve fuel capacity: 7 liters (1.85 gallons)
Tank design includes anti-slosh baffles for stability
Fuel level sensor integrated into the tank assembly

Fuel Pump and Injectors

Electric fuel pump with a flow rate of 120 liters/hour (31.7 gallons/hour)
Fuel pressure: 3.8 bar (55 psi) at idle
Multi-point fuel injection system with 4 injectors
Injector flow rate: 200 cc/min at 3 bar pressure
Injectors are electronically controlled for precise fuel delivery

Fuel System Performance

This section covers the performance characteristics of the fuel system, including fuel consumption, emissions, and diagnostic parameters.

Fuel Consumption

Urban fuel consumption: 11.5 liters/100 km (20.5 mpg)
Extra-urban fuel consumption: 7.2 liters/100 km (32.7 mpg)
Combined fuel consumption: 8.8 liters/100 km (26.7 mpg)
CO2 emissions: 210 g/km
Fuel efficiency optimized for performance and environmental compliance

Diagnostic Parameters

OBD-II compliant fuel system diagnostics
Fuel trim values: ±10% for short-term, ±25% for long-term
Fuel pressure sensor range: 0-5 bar (0-72.5 psi)
Injector pulse width: 1.5-10 ms depending on load and RPM
System self-diagnosis includes fuel pump and injector fault codes

Note: Regular diagnostic checks are recommended to maintain system performance.

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Component Specifications

Fuel Type

Recommended Fuel: Premium unleaded gasoline (95 RON minimum)

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

Octane Rating: 95 RON (91 AKI)

Ethanol Content: Maximum 10% ethanol (E10)

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

Fuel Tank

Capacity: 55 liters (14.5 gallons)

Material: High-density polyethylene (HDPE)

Part Number: 8L0201101

Pressure Relief Valve: Integrated, 0.3 bar (4.35 psi) release pressure

Notes: Tank includes an integrated fuel pump and level sensor

Fuel Pump

Type: Electric in-tank fuel pump

Flow Rate: 120 liters per hour (31.7 gallons per hour)

Operating Pressure: 3.5 bar (50.8 psi)

Part Number: 8E0919051

Voltage: 12V DC

Notes: Pump includes a built-in fuel filter

Fuel Filter

Type: In-line cartridge filter

Part Number: 8L0127544

Filter Micron Rating: 10 microns

Replacement interval: Every 60,000 km (37,282 miles) or 4 years

Notes: Located under the vehicle near the fuel tank

Fuel injectors

Type: Electronically controlled multi-point fuel injectors

Flow Rate: 200 cc/min at 3 bar (43.5 psi)

Part Number: 06A906031

Spray Pattern: 4-hole conical spray

Operating Voltage: 12V DC

Notes: Injectors are sequentially fired by the engine control unit (ECU)

Fuel Pressure Regulator

Type: Mechanical diaphragm regulator

Operating Pressure: 3.0 bar (43.5 psi)

Part Number: 06A127025

Location: Integrated into the fuel rail

Notes: Maintains consistent fuel pressure to the injectors

Fuel Rail

Material: Aluminum

Part Number: 06A133201

Pressure Test Port: Schrader valve, 3.0 bar (43.5 psi)

Notes: Includes mounting points for fuel injectors and pressure regulator

Fuel System Diagnostics

Obd2 Codes

P0171 - System too lean
P0172 - System too rich
P0181 - Fuel temperature sensor circuit range/performance
P0191 - Fuel rail pressure sensor circuit range/performance

Diagnostic Tools

VAG-COM diagnostic software
OBD2 scanner with Audi-specific protocols

Notes: Fuel system diagnostics require specialized tools for accurate troubleshooting

Fuel System Maintenance

inspection Interval: Every 30,000 km (18,641 miles) or 2 years

Maintenance Items

Check fuel lines for leaks or damage
Inspect fuel pump operation
Replace fuel filter as per schedule
Clean fuel injectors if necessary

Notes: Regular maintenance ensures optimal fuel system performance and longevity

Fuel System Safety

Fire Hazard: Highly flammable, avoid open flames or sparks

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

Ventilation: Ensure proper ventilation when working with fuel components

Notes: Always disconnect the battery before performing fuel system repairs

Service Information Service

Detailed service requirements and schedules for the fuel system

30,000 km (18,641 miles)

24 months

Inspect fuel lines and connections
Check fuel pump operation
Test fuel pressure

Ensure all connections are secure and free of leaks

60,000 km (37,282 miles)

48 months

Replace fuel filter
Clean fuel injectors
Inspect fuel tank for damage

Use only Audi-approved replacement parts

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of fuel is recommended for the 1999-2003 Audi S3?

The 1999-2003 Audi S3 requires premium unleaded gasoline with a minimum octane rating of 95 RON (Research Octane Number). For optimal performance, Audi recommends using fuel with an octane rating of 98 RON.

Can I use ethanol-blended fuel in my Audi S3?

The 1999-2003 Audi S3 is not designed to run on ethanol-blended fuels with more than 10% ethanol (E10). Using higher ethanol blends (e.g., E15 or E85) can damage the fuel system and engine components. Always check the fuel label for ethanol content before refueling.

What is the fuel tank capacity of the 1999-2003 Audi S3?

The fuel tank capacity of the 1999-2003 Audi S3 is 55 liters (approximately 14.5 gallons). This allows for a driving range of approximately 450-550 kilometers (280-340 miles) under normal driving conditions, depending on fuel efficiency.

What happens if I use lower-octane fuel than recommended?

Using fuel with an octane rating lower than 95 RON can cause engine knocking, reduced performance, and increased fuel consumption. Prolonged use of low-octane fuel may also lead to engine damage. Audi strongly advises against using fuel below the recommended octane rating.

Does the Audi S3 require fuel additives?

Audi does not recommend the use of fuel additives for the 1999-2003 S3. The engine and fuel system are designed to operate efficiently with high-quality fuel. Adding aftermarket additives may void the warranty or cause damage to 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.

Audi S3 Owner's Manual (1999-2003)

Coming Soon

The official owner's manual provides detailed information on fuel specifications, refueling procedures, and maintenance tips specific to the Audi S3.

Audi Fuel System Maintenance Guide

Coming Soon

A comprehensive guide on maintaining the fuel system, including fuel filter replacement, injector cleaning, and troubleshooting common fuel-related issues.

Audi Genuine Parts Catalog

Coming Soon

Access the official catalog for genuine Audi fuel system components, including fuel pumps, filters, and injectors, to ensure compatibility and performance.

Audi Technical Service Bulletins (TSBs)

Coming Soon

Review technical service bulletins related to fuel system updates, recalls, and common issues for the 1999-2003 Audi S3.

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