Cadillac STS 1998-2004 Fuel System Specifications
Discover the detailed fuel specifications for the 1998-2004 Cadillac STS, including fuel type, octane rating, tank capacity, and consumption. Essential for maintenance, performance, and compliance.
Overview Specifications
This document provides detailed fuel specifications for the 1998-2004 Cadillac STS. It includes information on fuel type, fuel economy, tank capacity, and performance-related details. Use this guide to understand the vehicle's fuel requirements and optimize its performance. The document is organized into sections for easy navigation, with quick reference tables for key specifications.
How to Use
Use the search function to quickly locate specific terms or topics related to the Cadillac STS fuel system. Enter keywords like 'fuel type' or 'tank capacity' for targeted results.
Navigate through the document by scrolling or clicking on section titles. Each section is labeled clearly and contains subsections with detailed information for easy access.
Key Specifications
Fuel Type
Premium Unleaded (91+ Octane)
Fuel Tank Capacity
18.5 gallons
City Mileage
15-17 mpg
Highway Mileage
23-25 mpg
Combined Mileage
18-20 mpg
Available Specifications
Fuel Type and Requirements
This section details the type of fuel recommended for the 1998-2004 Cadillac STS, along with any specific requirements or additives that may be necessary for optimal performance.
Fuel Type and Requirements
This section details the type of fuel recommended for the 1998-2004 Cadillac STS, along with any specific requirements or additives that may be necessary for optimal performance.
Recommended Fuel Type
- Premium unleaded gasoline with an octane rating of 91 or higher is recommended.
- Using lower octane fuel may result in reduced performance and engine knocking.
- Avoid using ethanol blends higher than 10% (E10) to prevent potential engine damage.
- Always refer to the owner's manual for specific fuel recommendations.
Fuel Additives
- Use fuel system cleaners periodically to maintain injector performance.
- Avoid additives containing methanol or silicone, which can harm the engine.
- Additives designed to improve octane rating can be used if premium fuel is unavailable.
- Consult a mechanic before using any aftermarket fuel additives.
Fuel Economy
This section provides information on the fuel efficiency of the 1998-2004 Cadillac STS, including city, highway, and combined mileage estimates.
Fuel Economy
This section provides information on the fuel efficiency of the 1998-2004 Cadillac STS, including city, highway, and combined mileage estimates.
Mileage Estimates
- City mileage: Approximately 15-17 miles per gallon (mpg).
- Highway mileage: Approximately 23-25 mpg.
- Combined mileage: Approximately 18-20 mpg.
- Actual mileage may vary based on driving conditions and habits.
Factors Affecting Fuel Economy
- Aggressive driving can significantly reduce fuel efficiency.
- Proper tire inflation and regular maintenance improve mileage.
- Using air conditioning or carrying heavy loads can decrease fuel economy.
- Driving at consistent speeds on highways maximizes efficiency.
Fuel Tank and Capacity
This section covers the fuel tank specifications of the 1998-2004 Cadillac STS, including its capacity and design features.
Fuel Tank and Capacity
This section covers the fuel tank specifications of the 1998-2004 Cadillac STS, including its capacity and design features.
Tank Capacity
- The fuel tank has a capacity of 18.5 gallons (70 liters).
- A low fuel warning light activates when approximately 2 gallons remain.
- Refueling should be done before the tank is completely empty to avoid fuel pump damage.
Tank Design and Safety
- The fuel tank is made of high-density polyethylene for durability.
- It includes a rollover valve to prevent fuel leakage during accidents.
- The tank is located beneath the rear seat for improved safety.
- Regularly inspect the tank for leaks or damage.
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Component Specifications
Overview
- Type
- Gasoline
- Configuration
- Internal Combustion Engine
- Platform
- Northstar V8
- Material
- Petroleum-based
- Location
- Fuel tank, rear of vehicle
Dimensions
- Fuel Tank Capacity
- 18.5 gallons (70 liters)
- Fuel Line Diameter
- 0.375 inches (9.525 mm)
- Fuel Pump Flow Rate
- 45 gallons per hour (170.34 liters per hour)
- Fuel Filter Size
- 3.5 inches x 2.5 inches (88.9 mm x 63.5 mm)
- Fuel injector Spray Angle
- 15 degrees
- Fuel Rail Pressure
- 45 psi (3.1 bar)
- Fuel Tank Material Thickness
- 0.12 inches (3.048 mm)
Materials
- Fuel Tank
- High-density polyethylene
- Fuel Lines
- Nitrile rubber with steel braiding
- Fuel Pump
- Brushed DC motor with stainless steel housing
- Fuel Filter
- Pleated paper element with aluminum housing
- Fuel injectors
- Stainless steel with Teflon seals
Features
- Fuel Delivery
-
- Sequential fuel injection
- Variable pressure fuel pump
- Returnless fuel system
- Pulse-width modulated injectors
- Fuel Storage
-
- Impact-resistant fuel tank
- Rollover valve safety feature
- Integrated fuel level sensor
- Vapor recovery system
- Fuel Management
-
- Electronic fuel control
- Adaptive fuel mapping
- Closed-loop feedback system
- Real-time fuel trim adjustments
Safety Features
- Collision Protection
-
- Automatic fuel shutoff
- Impact-resistant fuel tank
- Rollover valve
- Fire Prevention
-
- Flame arrestor in fuel filler neck
- Insulated fuel lines
- Fuel vapor recovery system
Comfort Features
- Refueling
-
- Easy-access fuel filler door
- Automatic fuel nozzle shutoff
- Locking fuel cap
- Driving
-
- Smooth fuel delivery
- Consistent fuel pressure
- Quiet fuel pump operation
Accessories
- Fuel System
-
- Replacement fuel filter
- Fuel injector cleaning kit
- Fuel system cleaner additive
- Diagnostics
-
- Fuel pressure tester
- Fuel injector tester
- Fuel system scanner
- Maintenance
-
- Fuel pump relay
- Fuel tank straps
- Fuel line connectors
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Replace fuel filter
- Inspect fuel lines for leaks
- Check fuel pump operation
- Clean fuel injectors
- Test fuel pressure
- Maintenance Notes
- Use only premium unleaded gasoline (91 octane or higher) for optimal performance
Warranty
- Fuel Pump
- Miles: 60,000Years: 5Coverage: Parts and labor
- Fuel Tank
- Miles: 100,000Years: 10Coverage: Parts only
- Fuel injectors
- Miles: 50,000Years: 4Coverage: Parts and labor
- Fuel System
- Miles: 70,000Years: 6Coverage: Diagnostics and repairs
Production Details
- Manufacturer
- General Motors
- Manufacturing Process
-
- Injection molding for fuel tank
- CNC machining for fuel injectors
- Robotic assembly for fuel pump
- Quality Control
- Pressure Testing: All fuel lines tested to 100 psiLeak Testing: Fuel tank tested for 24 hoursPerformance Testing: Fuel pump flow rate verified
- Sustainability Practices
-
- Recycled materials in fuel tank construction
- Low-emission manufacturing processes
- Recycling program for used fuel components
- Production Metrics
-
- Annual production: 50,000 units
- Yield rate: 99.2%
- Scrap rate: 0.8%
Service Information for fuel Service
Maintenance and service requirements specific to this component
- Replace fuel filter
- Inspect fuel lines for leaks
- Check fuel pump operation
- Clean fuel injectors
- Test fuel pressure
Use only approved fuel system cleaners
- Replace fuel pump if necessary
- Inspect fuel tank for damage
- Check fuel filler neck for obstructions
- Test fuel vapor recovery system
- Verify fuel level sensor accuracy
Fuel tank inspection requires special equipment
- Replace fuel pump assembly
- Inspect and replace fuel tank straps
- Replace fuel filter and lines if necessary
- Perform complete fuel system flush
- Verify all fuel system sensors
Major service requires professional equipment and expertise
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What are the technical specifications of the fuel system in a 1998-2004 Cadillac STS?
What are the technical specifications of the fuel system in a 1998-2004 Cadillac STS?
The 1998-2004 Cadillac STS features a fuel-injected 4.6L Northstar V8 engine. The fuel system includes a 19-gallon fuel tank, an in-tank fuel pump, and a fuel pressure regulator. The recommended fuel is premium unleaded with an octane rating of 91 or higher. The fuel injectors have a flow rate of 28 lbs/hr, and the fuel pump operates at 65 psi. Compatibility with aftermarket components requires adherence to these specifications.
Q2 What maintenance is required for the fuel system?
What maintenance is required for the fuel system?
Regular maintenance includes replacing the fuel filter every 15,000 to 30,000 miles. Fuel injectors should be cleaned every 30,000 miles. Inspect the fuel tank and lines annually for corrosion or damage. Use a fuel additive annually to prevent contamination. Always use the correct fuel type to maintain system health.
Q3 How do I replace the fuel pump?
How do I replace the fuel pump?
Start by disconnecting the battery. Drain the fuel tank. Remove the rear seat and trunk liner to access the tank. Disconnect electrical connectors and fuel lines. Remove the tank straps and take out the tank. Replace the pump, ensuring proper installation. Reinstall the tank, reconnect lines, and test the system for leaks.
Q4 How do I troubleshoot common fuel system issues?
How do I troubleshoot common fuel system issues?
Check the fuel gauge for low levels. Test fuel pressure with a gauge. Inspect lines and filter for blockages. Use a scan tool to check for error codes. Listen for unusual noises from the pump. If issues persist, consult a professional.
Q5 How can I optimize fuel system performance?
How can I optimize fuel system performance?
Use high-quality fuel and consider upgrading to high-flow injectors or a performance pump. Ensure proper engine tuning and regularly clean components. Monitor fuel trim levels to avoid issues. Maintain correct fuel pressure and filter condition for optimal performance.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Cadillac STS Service Manual (1998-2004)
Coming SoonDetailed technical specifications, maintenance schedules, and repair procedures for the fuel system.
Technical Service Bulletin - Fuel System Updates
Coming SoonOfficial updates and bulletins regarding fuel system components and performance enhancements.
Fuel System Parts Catalog
Coming SoonComprehensive list of genuine and aftermarket parts for the fuel system of 1998-2004 Cadillac STS.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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