Mitsubishi Mitsubishi Eclipse 1990-1994 Fuel System Specifications
Discover detailed fuel specifications for the 1990-1994 Mitsubishi Eclipse, including fuel type, tank capacity, system type, and economy. Essential for maintenance, performance, and troubleshooting.
Overview Specifications
This document provides detailed information about the fuel specifications and related systems for the 1990-1994 Mitsubishi Eclipse. It covers fuel types, fuel delivery systems, fuel efficiency, and maintenance tips. Use this guide to understand the technical aspects of your vehicle's fuel system, optimize performance, and ensure proper maintenance.
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Key Specifications
Fuel Type
Unleaded Gasoline
Octane Rating
87-91
Fuel Tank Capacity
15.9 gallons
Fuel Pump Pressure
38-46 psi
Average MPG
21-23 mpg
Available Specifications
Fuel Types and Recommendations
This section covers the types of fuel recommended for the 1990-1994 Mitsubishi Eclipse, including octane ratings and the impact of using different fuel types on engine performance and longevity.
Fuel Types and Recommendations
This section covers the types of fuel recommended for the 1990-1994 Mitsubishi Eclipse, including octane ratings and the impact of using different fuel types on engine performance and longevity.
Recommended Fuel Types
- Regular unleaded gasoline with an octane rating of 87 or higher.
- Premium unleaded gasoline with an octane rating of 91 or higher for optimal performance.
- Avoid using diesel or ethanol blends above E10.
- Using lower octane fuel may cause engine knocking and reduce efficiency.
Impact of Fuel Quality
- High-quality fuel helps maintain engine cleanliness and performance.
- Poor-quality fuel can lead to deposit buildup in the fuel system.
- Using the recommended octane rating ensures proper combustion.
- Regular use of fuel additives can help maintain fuel system health.
Fuel Delivery System
This section explains the components and operation of the fuel delivery system in the 1990-1994 Mitsubishi Eclipse, including the fuel pump, fuel injectors, and fuel pressure regulation.
Fuel Delivery System
This section explains the components and operation of the fuel delivery system in the 1990-1994 Mitsubishi Eclipse, including the fuel pump, fuel injectors, and fuel pressure regulation.
Fuel Pump
- Electric fuel pump located inside the fuel tank.
- Delivers fuel at a pressure of 38-46 psi.
- Maintains consistent fuel flow to the engine.
- Signs of failure include difficulty starting and engine stalling.
Fuel Injectors
- Electronic fuel injectors deliver precise amounts of fuel.
- Ensures efficient combustion and optimal performance.
- Clogged injectors can cause misfires and poor fuel economy.
- Regular cleaning or replacement is recommended.
Fuel Pressure Regulator
- Maintains consistent fuel pressure to the injectors.
- Located on the fuel rail.
- Faulty regulators can cause fuel pressure issues.
- Regular inspection and maintenance are essential.
Fuel Efficiency and Economy
This section provides insights into the fuel efficiency of the 1990-1994 Mitsubishi Eclipse, including factors that affect fuel economy and tips for improving mileage.
Fuel Efficiency and Economy
This section provides insights into the fuel efficiency of the 1990-1994 Mitsubishi Eclipse, including factors that affect fuel economy and tips for improving mileage.
Fuel Economy Ratings
- City driving: 18-20 mpg.
- Highway driving: 24-26 mpg.
- Combined average: 21-23 mpg.
- Actual mileage may vary based on driving conditions.
Improving Fuel Efficiency
- Regular maintenance of the fuel system and engine.
- Proper tire inflation and alignment.
- Avoiding aggressive driving and excessive idling.
- Using the recommended fuel type and octane rating.
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Component Specifications
Overview
- Type
- Gasoline
- Octane Rating
- 87 (Regular), 91 (Premium)
- Fuel System
- Multi-Port Fuel Injection
- Tank Capacity
- 15.9 gallons (60.2 liters)
- Fuel Economy
- 20 mpg city / 28 mpg highway (9.4 L/100km city / 8.4 L/100km highway)
Dimensions
- Tank Length
- 32.5 inches (82.6 cm)
- Tank Width
- 18.7 inches (47.5 cm)
- Tank Height
- 10.2 inches (25.9 cm)
- Filler Neck Diameter
- 1.5 inches (3.8 cm)
- Fuel Line Diameter
- 0.375 inches (9.5 mm)
- Fuel Pump Output
- 45 psi (3.1 bar)
- Fuel Filter Size
- 2.5 inches x 1.5 inches (6.4 cm x 3.8 cm)
Materials
- Tank Material
- High-density polyethylene (HDPE)
- Filler Neck Material
- Stainless steel
- Fuel Lines
- Reinforced rubber with nylon coating
- Fuel Pump
- Plastic housing with metal internals
- Fuel Filter
- Pleated paper element with metal casing
Features
- Fuel Delivery
-
- Multi-Port Fuel Injection (MPFI)
- Electric fuel pump
- Pressure regulator
- Returnless fuel system
- Tank Features
-
- Internal baffles for fuel slosh reduction
- Integrated fuel level sensor
- Vapor recovery system
- Rollover valve
- Emissions
-
- Evaporative emissions control
- Catalytic converter compatibility
- Oxygen sensor feedback system
- Safety
-
- Fuel cut-off switch in collisions
- Flame arrestor in filler neck
- Leak detection system
- Maintenance
-
- Replaceable fuel filter
- Serviceable fuel pump
- Drainable fuel tank
Safety Features
- Collision Protection
-
- Automatic fuel shut-off
- Impact-resistant fuel tank
- Fire Prevention
-
- Flame arrestor
- Vapor recovery system
- Leak Prevention
-
- Sealed fuel system
- Leak detection sensors
Comfort Features
- Refueling
-
- Easy-access filler neck
- Locking fuel cap
- Fuel level gauge accuracy
- Noise Reduction
-
- Quiet fuel pump operation
- Insulated fuel lines
- Driving
-
- Smooth fuel delivery
- Consistent fuel pressure
Accessories
- Fuel Caps
-
- Locking fuel cap
- Vented fuel cap
- OEM replacement cap
- Fuel Additives
-
- Fuel system cleaner
- Octane booster
- Fuel stabilizer
- Upgrades
-
- High-performance fuel pump
- Upgraded fuel filter
- Stainless steel fuel lines
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Inspect fuel lines for leaks
- Replace fuel filter
- Check fuel pump operation
- Clean fuel injectors
- Inspect fuel tank for damage
- Maintenance Notes
- Use only recommended fuel types and additives to maintain system integrity.
Warranty
- Basic Warranty
- Miles: 36,000Years: 3Coverage: Fuel system components excluding wear items
- Emissions Warranty
- Miles: 50,000Years: 5Coverage: Fuel system components affecting emissions
- Corrosion Warranty
- Miles: 100,000Years: 7Coverage: Fuel tank corrosion perforation
- Extended Warranty
- Miles: 100,000Years: 10Coverage: Optional extended coverage for fuel system
Production Details
- Manufacturer
- Mitsubishi Motors Corporation
- Manufacturing Process
-
- Injection molding for fuel tank
- CNC machining for fuel pump components
- Robotic assembly for fuel lines
- Quality Control
- Pressure Testing: Fuel tank and lines tested at 2x operating pressureLeak Testing: Full system leak detectionMaterial inspection: X-ray and ultrasonic testing for defects
- Sustainability Practices
-
- Recyclable fuel tank materials
- Low-emission manufacturing processes
- Waste reduction in production
- Production Metrics
- Annual Production: Approximately 50,000 unitsDefect Rate: Less than 0.1%Energy Efficiency: 15% improvement over previous models
Service Information for Fuel System Service
Maintenance and service requirements specific to the fuel system
- Inspect fuel lines and connections
- Replace fuel filter
- Check fuel pump pressure
- Test fuel injector operation
- Inspect fuel tank for damage or leaks
Use only OEM or equivalent replacement parts
- Clean fuel injectors
- Inspect and clean fuel tank
- Replace fuel pump if necessary
- Check fuel pressure regulator
- Test evaporative emissions system
Special tools required for fuel pump replacement
- Replace fuel pump assembly
- Inspect and replace fuel lines if needed
- Perform complete fuel system flush
- Test all fuel system sensors
- Inspect and clean throttle body
Major service interval - may require professional equipment
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What type of fuel is compatible with the 1990-1994 Mitsubishi Eclipse?
What type of fuel is compatible with the 1990-1994 Mitsubishi Eclipse?
The 1990-1994 Mitsubishi Eclipse is compatible with unleaded gasoline with an octane rating of 87 or higher. For optimal performance, it is recommended to use 91 octane or higher, especially for turbocharged models. Avoid using diesel or ethanol blends above 10%, as they can damage the fuel system. Always refer to the owner’s manual for specific fuel requirements and compatibility details.
Q2 What are the maintenance requirements for the fuel system of a 1990-1994 Mitsubishi Eclipse?
What are the maintenance requirements for the fuel system of a 1990-1994 Mitsubishi Eclipse?
Regular maintenance of 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. It’s also important to monitor fuel pressure and replace the fuel pump if necessary. Using high-quality fuel additives periodically can help maintain injector performance and prevent carbon buildup.
Q3 How do I replace the fuel pump in a 1990-1994 Mitsubishi Eclipse?
How do I replace the fuel pump in a 1990-1994 Mitsubishi Eclipse?
To replace the fuel pump, first, disconnect the negative battery terminal. Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls. Remove the rear seat to access the fuel pump assembly. Disconnect electrical connectors and fuel lines, then unscrew the retaining ring to remove the old pump. Install the new pump, reassemble in reverse order, and test for leaks before starting the engine.
Q4 What should I do if my 1990-1994 Mitsubishi Eclipse has fuel delivery issues?
What should I do if my 1990-1994 Mitsubishi Eclipse has fuel delivery issues?
If your Eclipse experiences fuel delivery problems, start by checking the fuel pump fuse and relay. Inspect fuel lines for leaks or blockages and test fuel pressure using a gauge. If pressure is low, the fuel pump or filter may need replacement. Clean or replace clogged fuel injectors and ensure the fuel tank is not contaminated. If issues persist, consult a professional mechanic for further diagnosis.
Q5 How can I optimize the fuel efficiency of my 1990-1994 Mitsubishi Eclipse?
How can I optimize the fuel efficiency of my 1990-1994 Mitsubishi Eclipse?
To improve fuel efficiency, ensure regular maintenance of the fuel system, including clean injectors and a properly functioning fuel pump. Use high-quality fuel with the recommended octane rating. Keep tires properly inflated, reduce unnecessary weight, and avoid aggressive driving. Regularly check and replace air filters, and ensure the engine is tuned correctly for optimal combustion and 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.
1990-1994 Mitsubishi Eclipse Service Manual
Coming SoonComprehensive guide covering maintenance, repair, and technical specifications for the 1990-1994 Mitsubishi Eclipse.
Technical Service Bulletin: Fuel System Updates
Coming SoonDetails updates and common issues related to the fuel system for the 1990-1994 Mitsubishi Eclipse.
Mitsubishi Eclipse Parts and Accessories Catalog
Coming SoonCatalog listing OEM and aftermarket parts and accessories for the 1990-1994 Mitsubishi Eclipse.
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