Lexus LS 1989-1994 Fuel System Specifications
Explore detailed fuel specifications for the 1989-1994 Lexus LS, including fuel type, tank capacity, and economy. Ideal for maintenance, repairs, and performance upgrades.
Overview Specifications
This document provides detailed fuel specifications for the 1989-1994 Lexus LS. It includes information on fuel type, efficiency, tank capacity, and related technical details. Use this guide to understand the fuel requirements and performance metrics of the vehicle. The document is organized into sections for easy navigation, with quick reference tables for key specifications.
How to Use
Use the search function to find specific terms or phrases related to fuel specifications. Enter keywords like 'fuel type' or 'mileage' to quickly locate relevant information.
Navigate through the document using the section titles and subsections. Each section is labeled clearly, and subsections provide detailed points for easy reference.
Key Specifications
Fuel Type
Premium Unleaded (91+ octane)
Tank Capacity
22.5 gallons
City MPG
17 MPG
Highway MPG
23 MPG
Combined MPG
19 MPG
Available Specifications
Fuel Type and Requirements
This section covers the type of fuel recommended for the 1989-1994 Lexus LS, including octane ratings and any special requirements for optimal performance.
Fuel Type and Requirements
This section covers the type of fuel recommended for the 1989-1994 Lexus LS, including octane ratings and any special requirements for optimal performance.
Recommended Fuel Type
- Premium unleaded gasoline with an octane rating of 91 or higher
- Regular unleaded gasoline (87 octane) can be used but may reduce performance
- Avoid using diesel or ethanol blends above 10%
- Fuel additives are not required but can be used for maintenance
Fuel System Specifications
- Electronic fuel injection system
- Fuel tank capacity: 22.5 gallons (85 liters)
- Fuel pump pressure: 38-44 psi
- Fuel filter replacement interval: Every 30,000 miles
Fuel Efficiency and Mileage
This section provides details on the fuel efficiency and mileage of the 1989-1994 Lexus LS, including city, highway, and combined MPG ratings.
Fuel Efficiency and Mileage
This section provides details on the fuel efficiency and mileage of the 1989-1994 Lexus LS, including city, highway, and combined MPG ratings.
Mileage Ratings
- City mileage: 17 MPG
- Highway mileage: 23 MPG
- Combined mileage: 19 MPG
- Range: Approximately 427 miles on a full tank
Factors Affecting Efficiency
- Driving habits (aggressive driving reduces efficiency)
- Vehicle maintenance (clean air filters improve mileage)
- Tire pressure (underinflated tires decrease MPG)
- Environmental conditions (cold weather reduces efficiency)
Fuel Tank and Refueling
This section covers the fuel tank design, refueling process, and safety precautions for the 1989-1994 Lexus LS.
Fuel Tank and Refueling
This section covers the fuel tank design, refueling process, and safety precautions for the 1989-1994 Lexus LS.
Fuel Tank Design
- Material: High-density polyethylene
- Location: Rear of the vehicle, under the trunk
- Safety features: Impact-resistant design and rollover valve
- Capacity: 22.5 gallons (85 liters)
Refueling Instructions
- Turn off the engine before refueling
- Use the fuel door release lever inside the vehicle
- Insert the fuel nozzle fully into the tank opening
- Avoid overfilling to prevent spillage
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Component Specifications
Overview
- Type
- Gasoline
- Octane Rating
- 91 (recommended)
- Fuel System
- Electronic Fuel Injection (EFI)
- Tank Capacity
- 22.2 gallons (84 liters)
- Fuel Economy
- 18 mpg city / 23 mpg highway (estimated)
- Emission Standard
- Tier 0 (pre-OBD-II)
Dimensions
- Fuel Tank Length
- 34.5 inches (876 mm)
- Fuel Tank Width
- 24.8 inches (630 mm)
- Fuel Tank Height
- 12.6 inches (320 mm)
- Fuel Line Diameter
- 0.375 inches (9.5 mm)
- Fuel Pump Pressure
- 38 psi (262 kPa)
- Fuel Filter Size
- 0.75 inches diameter x 3.5 inches length (19 mm x 89 mm)
- Fuel injector Flow Rate
- 190 cc/min
Materials
- Fuel Tank
- High-density polyethylene (HDPE)
- Fuel Lines
- Nitrile rubber with steel reinforcement
- Fuel Pump
- Brushed DC motor with stainless steel housing
- Fuel Filter
- Pleated paper element with metal casing
- Fuel injectors
- Stainless steel with Teflon seals
Features
- Fuel Delivery
-
- Sequential multi-port fuel injection
- High-pressure fuel pump
- Returnless fuel system
- Variable fuel pressure regulation
- Monitoring
-
- Fuel level sensor with float mechanism
- Low fuel warning light
- Fuel consumption display
- Fuel system diagnostic codes
- Safety
-
- Rollover valve in fuel tank
- Fuel cut-off inertia switch
- Vapor recovery system
- Flame arrestor in fuel filler neck
- Efficiency
-
- Optimized fuel injector spray pattern
- Air-fuel ratio feedback control
- Cold start enrichment system
- Deceleration fuel cut-off
- Maintenance
-
- Replaceable fuel filter
- Serviceable fuel pump
- Accessible fuel injectors
- Drainable fuel tank
Safety Features
- Fire Prevention
-
- Fuel tank impact protection
- Fuel line quick-disconnect fittings
- Fuel vapor canister
- Leak Prevention
-
- Double-walled fuel tank
- Sealed fuel system
- Pressure relief valve
- Crash Safety
-
- Automatic fuel pump shut-off
- Reinforced fuel tank mounting
- Protected fuel lines
Comfort Features
- Refueling
-
- Easy-access fuel filler door
- Automatic fuel filler shut-off
- Fuel cap tether
- Driving
-
- Smooth fuel delivery
- Quiet fuel pump operation
- Stable fuel pressure
- Maintenance
-
- Clear fuel filter replacement indicators
- Accessible fuel system components
- Durable fuel system materials
Accessories
- Performance
-
- High-flow fuel pump
- Upgraded fuel injectors
- Fuel pressure regulator
- Fuel system cleaner
- Monitoring
-
- Fuel pressure gauge
- Fuel consumption meter
- Fuel level sensor tester
- Maintenance
-
- Fuel filter wrench
- Fuel line disconnect tool
- Fuel injector cleaning kit
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Inspect fuel lines for leaks
- Replace fuel filter
- Clean fuel injectors
- Check fuel pump pressure
- Inspect fuel tank for damage
- Maintenance Notes
- Use only recommended fuel grade. Avoid running fuel tank below 1/4 capacity to prevent pump overheating.
Warranty
- Fuel System Warranty
- Miles: 50,000Years: 5Coverage: Fuel pump, injectors, and lines
- Emissions Warranty
- Miles: 80,000Years: 8Coverage: Fuel system components affecting emissions
- Corrosion Warranty
- Miles: UnlimitedYears: 6Coverage: Fuel tank corrosion
- Parts Warranty
- Miles: 12,000Years: 1Coverage: Replacement fuel system parts
Production Details
- Manufacturer
- Aisan Industry Co., Ltd.
- Manufacturing Process
-
- Injection molding for fuel tank
- CNC machining for fuel injectors
- Robotic assembly for fuel pump
- Quality Control
- Pressure Testing: 100% fuel system pressure testingLeak Testing: Helium leak detectionDurability Testing: 500,000 cycle fuel pump testing
- Sustainability Practices
-
- Recyclable fuel tank materials
- Low-VOC fuel system components
- Energy-efficient manufacturing
- Production Metrics
- Annual Production: 500,000 unitsDefect Rate: 0.01%Energy Usage: 15 kWh per unit
Service Information for fuel Service
Maintenance and service requirements specific to the fuel system
- Inspect fuel lines and connections
- Replace fuel filter
- Check fuel pump operation
- Test fuel pressure
- Inspect fuel tank for damage
Use only OEM or equivalent fuel filter for replacement
- Clean fuel injectors
- Inspect fuel vapor system
- Check fuel filler neck and cap
- Test fuel level sensor accuracy
- Inspect fuel pump wiring
Specialized fuel injector cleaning equipment required
- Replace fuel pump assembly
- Inspect and clean fuel tank
- Replace fuel pressure regulator
- Check all fuel system hoses
- Perform complete fuel system diagnostic
Fuel tank removal may be required for thorough inspection
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What type of fuel is compatible with the 1989-1994 Lexus LS?
What type of fuel is compatible with the 1989-1994 Lexus LS?
The 1989-1994 Lexus LS is designed to run on premium unleaded gasoline with an octane rating of 91 or higher. Using lower-octane fuel may result in reduced performance and engine knocking. The fuel tank capacity is 22.5 gallons, and the vehicle is equipped with a fuel-injected system for optimal efficiency. Always refer to the owner's manual for specific fuel recommendations.
Q2 What are the maintenance requirements for the fuel system in a 1989-1994 Lexus LS?
What are the maintenance requirements for the fuel system in a 1989-1994 Lexus LS?
Regular maintenance for the fuel system includes inspecting and replacing the fuel filter every 30,000 miles, checking fuel lines for leaks or wear, and ensuring the fuel injectors are clean. The fuel pump should be tested periodically for proper pressure. Additionally, using fuel system cleaners every 10,000 miles can help maintain optimal performance and prevent buildup in the fuel system.
Q3 How do I replace the fuel filter in a 1989-1994 Lexus LS?
How do I replace the fuel filter in a 1989-1994 Lexus LS?
To replace the fuel filter, first, relieve the fuel system pressure by disconnecting the fuel pump fuse and running the engine until it stalls. Locate the fuel filter, typically near the fuel tank. Disconnect the fuel lines and remove the old filter. Install the new filter, ensuring the flow direction matches the arrows on the filter. Reconnect the fuel lines, reinstall the fuse, and start the engine to check for leaks.
Q4 What should I do if my 1989-1994 Lexus LS has poor fuel economy or engine performance?
What should I do if my 1989-1994 Lexus LS has poor fuel economy or engine performance?
Poor fuel economy or performance may indicate issues such as clogged fuel injectors, a dirty air filter, or a malfunctioning oxygen sensor. Start by checking the air filter and replacing it if necessary. Use a fuel system cleaner to address injector issues. If problems persist, inspect the oxygen sensor and fuel pressure regulator. Consult a professional mechanic for advanced diagnostics.
Q5 How can I optimize the fuel efficiency of my 1989-1994 Lexus LS?
How can I optimize the fuel efficiency of my 1989-1994 Lexus LS?
To optimize fuel efficiency, ensure regular maintenance, including timely oil changes, air filter replacements, and tire pressure checks. Use premium fuel as recommended and avoid aggressive driving. Keep the fuel system clean by using additives periodically. Additionally, ensure the engine is properly tuned and the oxygen sensor is functioning correctly to maintain optimal fuel-air mixture.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
1989-1994 Lexus LS Service Manual
Coming SoonComprehensive guide covering maintenance, repairs, and technical specifications for the 1989-1994 Lexus LS.
Technical Service Bulletin: Fuel System Updates
Coming SoonDetails updates and fixes for the fuel system in the 1989-1994 Lexus LS, including common issues and solutions.
Lexus LS Parts and Accessories Catalog
Coming SoonCatalog listing OEM and aftermarket parts and accessories for the 1989-1994 Lexus LS, including fuel system components.
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