Audi Audi S4 1997-2002

Audi Audi S4 1997-2002 Fuel System Specifications

Detailed technical guide for the 1997-2002 Audi S4 fuel system, covering fuel type, pressure, injector specs, pump details, and diagnostics. Essential for maintenance and repair.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the fuel specifications for the 1997-2002 Audi S4, including key features, measurements, and technical details. This section covers fuel type, octane rating, fuel system components, and performance considerations.

How to Use

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

Navigate through the fuel documentation sections using the table of contents or by scrolling through the major sections and subsections.

Key Specifications

Fuel Type

Premium unleaded (91+ octane)

Fuel Tank Capacity

62 liters (16.4 gallons)

Fuel Pump Pressure

3.8 bar (55 psi)

Injector Flow Rate

280 cc/min

Fuel Filter Interval

40,000 miles

Available Specifications

Fuel Type and Octane Rating

This section details the recommended fuel type and octane rating for optimal performance and engine longevity.

Recommended Fuel Type

Use premium unleaded gasoline with an octane rating of 91 or higher
Lower octane fuel may cause engine knocking and reduced performance
Ethanol blends up to 10% (E10) are acceptable
Avoid using diesel or alternative fuels not specified by Audi

Octane Rating Specifications

Minimum octane rating: 91 RON (Research Octane Number)
Optimal octane rating: 95 RON for peak performance
Higher octane fuels may improve throttle response
Engine control unit (ECU) adjusts timing based on fuel quality

Note: Using fuel with an octane rating below 91 may void the warranty.

Fuel System Components

This section provides an overview of the fuel system components, including the fuel pump, injectors, and pressure specifications.

Fuel Pump Specifications

Electric in-tank fuel pump with a flow rate of 120 L/h
Operating pressure: 3.8 bar (55 psi)
Fuel pump relay located in the relay panel under the dashboard
Replacement interval: 100,000 miles or as needed

Fuel Injector Details

Bosch EV6 injectors with a flow rate of 280 cc/min
Injector operating pressure: 3.0-4.0 bar (43-58 psi)
Direct injection system for precise fuel delivery
Injector resistance: 12-16 ohms at 20°C

Note: Ensure injectors are cleaned or replaced if fuel flow is inconsistent.

Fuel Tank and Capacity

This section covers the fuel tank design, capacity, and related specifications.

Fuel Tank Design

Plastic fuel tank with a capacity of 62 liters (16.4 gallons)
Integrated fuel level sensor with float mechanism
Tank includes a rollover valve for safety
Weight of full tank: approximately 45 kg (99 lbs)

Fuel Capacity and Range

Total capacity: 62 liters (16.4 gallons)
Reserve capacity: 8 liters (2.1 gallons)
Estimated range: 450-550 km (280-340 miles) per tank
Fuel consumption: 11-13 L/100 km (21-18 mpg) combined

Note: Range may vary based on driving conditions and load.

Fuel System Maintenance

This section outlines maintenance procedures and intervals for the fuel system.

Fuel Filter Replacement

Replace fuel filter every 40,000 miles or 4 years
Filter location: under the vehicle near the fuel tank
Filter part number: 8D0 201 511
Use only OEM or equivalent replacement filters

Fuel System Cleaning

Clean fuel injectors every 30,000 miles
Use Audi-approved fuel system cleaner
Inspect fuel lines for leaks or damage during service
Check fuel pressure regulator for proper operation

Note: Regular cleaning prevents carbon buildup and maintains performance.

Search Specifications

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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)

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

Fuel System

Fuel Delivery: Sequential multi-port fuel injection

Fuel Pump Pressure: 3.8 - 4.2 bar (55 - 61 psi)

Fuel Filter Part Number: 8D0 201 511 A

Fuel Tank Capacity: 62 liters (16.4 gallons)

Fuel Tank Material: High-density polyethylene (HDPE)

Fuel injectors

Type: Bosch EV6 solenoid injectors

Flow Rate: 210 cc/min at 3 bar

Part Number: 0280 155 968

Resistance: 12 - 16 ohms

Spray Pattern: Multi-hole conical spray

Fuel Pump

Type: In-tank electric fuel pump

Part Number: 8D0 906 091 C

Flow Rate: 120 liters/hour at 3 bar

Voltage: 12V DC

Current Draw: 5 - 7 amps

Fuel Pressure Regulator

Type: Mechanical diaphragm regulator

Part Number: 078 133 534 A

Pressure Setting: 3.8 bar (55 psi)

Tolerance: ±0.2 bar (±3 psi)

Location: Integrated into fuel rail

Fuel Rail

Material: Aluminum

Part Number: 8D0 133 217 F

injector Connection: Quick-connect fittings

Pressure Test Port: Schrader valve for pressure testing

Fuel Filter

Type: In-line cartridge filter

Part Number: 8D0 201 511 A

Replacement interval: Every 60,000 miles or 60 months

Micron Rating: 10 microns

Flow Rate: 60 liters/hour at 3 bar

Fuel Tank Ventilation

Evaporative Emissions System: Closed-loop system with charcoal canister

Charcoal Canister Part Number: 8D0 201 801 C

Purge Valve Part Number: 8D0 906 517 A

Vent Valve Part Number: 8D0 906 283 B

Note: System prevents fuel vapor release into the atmosphere

Fuel System Diagnostics

Obdii Monitoring: Compliant with OBD-II standards

Fault 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 Tool: VAG-COM or equivalent

Note: Regularly check for stored fault codes and address promptly

Fuel System Maintenance

injector Cleaning Interval: Every 30,000 miles or 24 months

Fuel Filter Replacement interval: Every 60,000 miles or 60 months

Fuel Pump inspection Interval: Every 100,000 miles or 120 months

Note: Use only Audi-approved cleaning additives and replacement parts

Fuel System Service Information Service

Detailed service requirements and schedules for the fuel system

30,000

Inspect fuel injectors for clogging
Clean fuel injectors using approved cleaner
Check fuel pressure and flow rate

Use only Audi-approved cleaning solutions

60,000

Replace fuel filter
Inspect fuel lines for leaks or damage
Check fuel pump operation and pressure

Replace with OEM fuel filter for optimal performance

100,000

120

Inspect fuel pump for wear or failure
Replace fuel pump if necessary
Check evaporative emissions system for leaks

Use diagnostic tools to verify system integrity

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of fuel is recommended for the 1997-2002 Audi S4?

The 1997-2002 Audi S4 requires premium unleaded gasoline with an octane rating of 91 or higher. Using lower octane fuel can result in reduced performance and potential engine knocking.

What is the fuel tank capacity of the 1997-2002 Audi S4?

The fuel tank capacity of the 1997-2002 Audi S4 is 62 liters (16.4 gallons). This allows for a balance between range and vehicle weight.

Can I use ethanol-blended fuel in my 1997-2002 Audi S4?

The 1997-2002 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 warranty.

What is the fuel consumption rate for the 1997-2002 Audi S4?

The 1997-2002 Audi S4 has an average fuel consumption of approximately 12.4 liters per 100 kilometers (19 mpg) in city driving and 8.5 liters per 100 kilometers (28 mpg) on the highway, depending on driving conditions and maintenance.

How often should I replace the fuel filter on my 1997-2002 Audi S4?

The fuel filter on the 1997-2002 Audi S4 should be replaced every 60,000 kilometers (37,000 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 Soon

Detailed guide on maintaining the fuel system, including filter replacement, fuel injector cleaning, and troubleshooting common issues.

Premium Fuel vs. Regular Fuel: What You Need to Know

Coming Soon

Explains the differences between premium and regular fuel, and why the 1997-2002 Audi S4 requires premium unleaded gasoline.

Audi S4 Fuel Pump Replacement Procedure

Coming Soon

Step-by-step instructions for replacing the fuel pump in the 1997-2002 Audi S4, including safety precautions and required tools.

Understanding Fuel Octane Ratings

Coming Soon

A technical overview of octane ratings and their impact on engine performance, specifically for high-performance vehicles like the Audi S4.

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