10 Best Fuel Pumps for Subaru STI Reviewed for 2025

As a fellow Subaru STI enthusiast, I know the thrill of pushing that legendary EJ257 engine. Whether you’re chasing more horsepower on the track or just want rock-solid reliability for spirited street driving, one component often gets overlooked until it’s too late: the fuel pump. Our Subaru STIs demand a consistent, high-pressure fuel supply, and if your stock pump is struggling, you’ll feel it in performance dips, hesitation, or worse. I’ve spent my fair share of time under the rear seat, wrestling with fuel pump assemblies, so I know a thing or two about what works. This guide is designed to cut through the noise, offering my insights and a detailed look at some of the best fuel pumps for Subaru STI models, along with crucial related components, to help you make an informed decision and keep your ride running strong. We’ll cover everything from OEM-style replacements to serious performance upgrades and even essential filters.

IMAGE	PRODUCT NAME	AMAZON LINK
	A-Premium Electric Fuel Pump Module Assembly w/Sending Unit…	View on Amazon
	A-Premium Electric Fuel Pump Module with Sending Unit…	View on Amazon
	QFS-344FT-1008 – Performance 340LPH Fuel Pump Replacement…	View on Amazon
	GETOPAUTO 42072AG140 Fuel Pump Filter Compatible With…	View on Amazon
	Subaru NEW 2008-2018 Subaru Fuel Pump Filter Impreza WRX…	View on Amazon
	KEMSO 340LPH High Performance Fuel Pump for Subaru Legacy…	View on Amazon
	Deatschwerks 08-21 Subaru WRX/STI X2 Series Fuel Pump Module	View on Amazon
	TCINDRR 42072AG140 Fuel Pump Filter 23300-20130 23300-31110…	View on Amazon
	KEMSO 340LPH High Performance Fuel Pump for Subaru/Honda…	View on Amazon
	KEMSO 340LPH High Performance Fuel Pump for Subaru/Honda…	View on Amazon

Product Reviews

1. A-Premium Electric Fuel Pump Module Assembly w/Sending Unit (2008-2011 STI)

When your 2008-2011 STI needs a complete fuel system refresh without diving into heavy modifications, this A-Premium assembly is a solid contender. It’s designed as a direct, drop-in replacement, meaning less hassle during installation. This unit comes as a full assembly, including the fuel pump, fuel sending unit, and strainer, which is fantastic for ensuring everything works together seamlessly. It’s built for the H4 2.5L Gas (EJ257 Turbocharged) engine, so it’s specifically tailored for our STIs from those years, providing a reliable, factory-like performance. With a one-year warranty, you get a decent peace of mind knowing your daily driver’s fuel delivery is covered.

• Vehicle Fitment: Compatible with Subaru Impreza WRX STI 2008-2011 (H4 2.5L Gas, EJ257 Turbocharged).
• Reference Number: 42021FG050, FG1915, P76717M, SP4114M.
• Package Contents: Complete fuel pump assembly including pump, sending unit, and strainer.
• Warranty: One-year unlimited-mileage guarantee.

Pros:
– Complete assembly for easy, direct replacement.
– Includes sending unit and strainer, making it a comprehensive fix.
– Good for restoring stock performance and reliability.
– Comes with a useful one-year warranty.

Cons:
– Not designed for high-horsepower aftermarket applications.
– Specific to earlier STI models, limiting broader compatibility.

Best for: STI owners needing a reliable, direct OEM-style replacement for a failing fuel pump in 2008-2011 models, focused on maintaining stock performance.

User feedback summary: Many users appreciate the ease of installation as a direct fit. They often report that it resolves fuel delivery issues like stalling or poor starting, making their STI feel like new again at a more accessible price point than OEM.

2. A-Premium Electric Fuel Pump Module with Sending Unit (2019-2020 STI)

For later model STI owners, specifically 2019-2020, this A-Premium fuel pump module offers a similar OEM-level replacement solution. Like its earlier counterpart, it’s a complete assembly, which simplifies the replacement process significantly. It’s tailored for the H4 2.5L engine, ensuring compatibility and proper function for your specific STI. Having the fuel pump, sending unit, strainer, and float all in one package means you’re addressing multiple potential failure points simultaneously. If you’re looking to refresh your fuel system without making performance modifications, this unit provides a reliable and straightforward option.

• Vehicle Fitment: Compatible with Subaru WRX STI 2019-2020 (H4 2.5L).
• Reference Number: 42021FL02B, 42021FL02D, 42021FL02C.
• Package Contents: Complete fuel pump assembly including pump, sending unit, strainer, and float.
• Warranty: One-year unlimited-mileage guarantee.

Pros:
– Complete, direct-fit assembly for later model STIs.
– Includes all necessary components for a full replacement.
– Restores factory fuel system performance.
– Backed by a one-year warranty for peace of mind.

Cons:
– Not suitable for highly modified engines requiring increased fuel flow.
– Limited to specific newer model years.

Best for: Owners of 2019-2020 Subaru STIs needing a dependable, full OEM-style fuel pump assembly replacement to restore factory performance.

User feedback summary: Owners frequently highlight the perfect fitment and ease of installation for newer STI models. They commend its ability to eliminate common fuel delivery problems, making it a reliable choice for a stock replacement.

3. QFS-344FT-1008 – Performance 340LPH Fuel Pump Replacement

Now we’re stepping into performance territory! The QFS-344FT-1008 is a serious upgrade designed for STIs that are pushing beyond stock power levels. This 340LPH (liters per hour) fuel pump can support up to 600 horsepower in naturally aspirated, turbocharged, or supercharged applications – perfect for a modified STI. What makes it particularly appealing is its “drop-in installation” claim, aiming to simplify what can sometimes be a complex job. It’s built with high-quality engineering to ensure it stands up to the demands of a high-performance engine, and the lifetime warranty from a USA-based company offers exceptional long-term confidence.

• Performance: Supports up to 600 bhp (N/A, turbocharged, supercharged).
• Installation: Quick & easy drop-in installation, direct replacement.
• Reliability: Peak engineering for guaranteed reliability and longevity.
• Warranty: Lifetime warranty with USA-based customer service.

Pros:
– Significant flow increase for high-horsepower STIs.
– Designed for direct replacement, simplifying installation.
– Robust construction promises durability.
– Exceptional lifetime warranty.

Cons:
– May require tuning adjustments to utilize its full potential.
– Only the pump itself, may need to reuse or upgrade other module components.

Best for: Enthusiasts with modified Subaru STIs aiming for significant horsepower gains (up to 600hp) who need a reliable, high-flow fuel pump with a strong warranty.

User feedback summary: Users consistently praise its impressive fuel delivery capacity and report smooth performance even under heavy boost. The lifetime warranty is often cited as a major confidence booster for those pushing their STI’s limits.

4. GETOPAUTO 42072AG140 Fuel Pump Filter Compatible With…

While not a fuel pump itself, this GETOPAUTO fuel pump filter is an absolutely critical component for the longevity and performance of your Subaru STI’s fuel system. Its primary function is to trap impurities like rust, dirt, and debris before they can reach your fuel pump or, worse, your injectors. Over time, a clogged filter can starve your fuel pump, leading to premature failure, or compromise fuel delivery, affecting performance. This specific filter is compatible with a wide range of Subaru models, including the 2008-2018 STI, making it an essential maintenance item. It’s an aftermarket replacement, offering a cost-effective way to protect your expensive fuel system components.

• Function: Filters solid impurities (iron oxide, dust, etc.) from fuel.
• Protection: Protects fuel pump nozzle, cylinder liner, and piston ring.
• Fitment: Compatible with 2008-2018 Subaru STI, Forester Turbo, Impreza WRX/non-turbo.
• Replaces Parts: 23300-20130, 42072AG140, among others.

Pros:
– Essential for protecting the fuel pump and injectors.
– Wide compatibility with various STI model years.
– Cost-effective aftermarket replacement.
– Prevents clogging and reduces wear on fuel system components.

Cons:
– Installation can be tricky as it’s typically inside the fuel tank assembly.
– Requires periodic replacement, though not a fuel pump itself.

Best for: All Subaru STI owners performing routine fuel system maintenance or replacing their fuel pump, ensuring clean fuel delivery and extending component life.

User feedback summary: Many users highlight the importance of replacing this filter when servicing their fuel pump. They report noticeable improvements in fuel delivery consistency and peace of mind knowing their engine is receiving clean fuel.

5. Subaru NEW 2008-2018 Subaru Fuel Pump Filter Impreza WRX…

This is another crucial fuel pump filter, directly from Subaru (or a direct OEM-equivalent if not explicitly stated as genuine Subaru, but listed as such). Like the GETOPAUTO, its role is paramount in maintaining fuel system health for your STI. It filters out harmful contaminants, ensuring that your fuel pump operates efficiently and your injectors don’t get clogged. Given its wide compatibility with 2008-2018 Subaru STI models, it’s a versatile choice for many owners. Choosing a known or OEM-style filter like this can provide an extra layer of confidence in its quality and fitment.

• Part Name: Fuel Pump Filter 42072AG140.
• Fitment: 2008-2018 Subaru STI, Impreza WRX, Impreza EJ253 non-turbo, Forester Turbo.
• Function: Filters fuel to protect fuel pump and injectors.

Pros:
– OEM-level quality for reliability and precise fitment.
– Crucial for preventing damage to fuel system components.
– Broad compatibility across many STI model years.
– Ensures clean fuel delivery for optimal engine performance.

Cons:
– Might be slightly more expensive than generic aftermarket alternatives.
– Requires careful installation within the fuel pump module.

Best for: Subaru STI owners who prefer an OEM or high-quality OEM-equivalent filter for their 2008-2018 models, prioritizing known reliability for fuel system protection.

User feedback summary: Owners often choose this filter for its reliable, exact fit and the assurance of using a part designed specifically for their Subaru. They appreciate its role in keeping their fuel system pristine.

6. KEMSO 340LPH High Performance Fuel Pump for Subaru Legacy…

The KEMSO 340LPH pump is a serious player in the performance fuel pump arena, specifically designed to meet the demands of highly modified Subaru STIs. With a flow rate capable of supporting up to 600 BHP, this pump is ideal for those running big turbo setups, E85, or other extensive engine modifications. A significant advantage is its compatibility with both gasoline and E85 fuels, offering flexibility for performance enthusiasts. KEMSO also stands out with USA-based support and an impressive lifetime warranty, which speaks volumes about their confidence in the product’s durability and engineering. The bypass valve set at a higher pressure also indicates it’s built for sustained performance.

• Performance: Supports up to 600 BHP (N/A, Turbocharged, Supercharged).
• Fuel Compatibility: Designed for gasoline or E85.
• Bypass Valve: Set at 125.8psi, higher than many competitors.
• Warranty: Serialized fuel pump body guarantees Lifetime warranty, USA-based support.

Pros:
– High flow rate for significant horsepower upgrades.
– E85 compatible, expanding tuning options.
– Robust design with a higher bypass valve setting.
– Excellent lifetime warranty and USA-based technical support.

Cons:
– Requires professional installation and tuning for optimal results.
– Might be overkill for completely stock STIs.

Best for: Subaru STI owners seeking a high-performance, E85-compatible fuel pump for significant horsepower gains and extensive modifications, who value a strong warranty and dedicated support.

User feedback summary: Owners frequently report consistent, strong fuel pressure even under hard driving and aggressive tuning. The E85 compatibility is a huge plus, and many are reassured by KEMSO’s lifetime warranty and responsive USA support.

7. Deatschwerks 08-21 Subaru WRX/STI X2 Series Fuel Pump Module

Deatschwerks is a name synonymous with high-performance fuel systems, and their X2 Series Fuel Pump Module for 2008-2021 Subaru WRX/STI is a testament to that. This isn’t just a pump; it’s a complete fuel pump module, meaning it’s designed to drop right into your existing fuel hanger, integrating seamlessly with your STI’s fuel system. Deatschwerks pumps are renowned for their reliability and consistent flow, making them a top choice for serious builds. The X2 series is built to handle significant power, often exceeding the needs of most street-driven modified STIs, while still offering the convenience of a module.

• Product Type: X2 Series Fuel Pump Module.
• Compatibility: Compatible with/Replacement for Subaru WRX/STI 2008-2021.
• Brand Reputation: Deatschwerks known for high-performance fuel systems.

Pros:
– Complete module simplifies installation and ensures proper fitment.
– High-performance capabilities suitable for heavily modified STIs.
– Reputable brand known for quality and reliability.
– Wide model year compatibility.

Cons:
– Premium price point compared to pump-only options.
– May require tuning to fully utilize its potential.

Best for: Serious Subaru STI builders and tuners looking for a comprehensive, high-performance fuel pump module from a trusted brand, suitable for 2008-2021 models and substantial power upgrades.

User feedback summary: Users often highlight the exceptional quality and reliability of Deatschwerks products. They appreciate the convenience of the module design, making installation smoother, and report consistent, high fuel pressure for their high-powered STIs.

8. TCINDRR 42072AG140 Fuel Pump Filter 23300-20130 23300-31110…

Here’s another aftermarket fuel pump filter option, the TCINDRR 42072AG140. Just like the others, this filter is a vital component for keeping your Subaru STI’s fuel system clean and protected. It’s designed to replace OEM part numbers and ensures that debris, rust, and other contaminants don’t reach your fuel pump or clog your injectors. Its broad compatibility with 2008-2018 Subaru STIs, WRXs, and Foresters makes it a versatile choice for routine maintenance. Choosing a tested and reliable filter like this can save you from costly repairs down the line by preventing premature wear on your fuel pump and engine components.

• Part Name: Fuel Pump Filter.
• Part Number: 23300-20130, 42072AG140, among others.
• Compatibility: Compatible with 2008-2018 Subaru STI, Forester Turbo, Impreza WRX/non-turbo.
• Quality: Tested for reliability and performance.

Pros:
– Effective at filtering fuel impurities, protecting the fuel pump.
– Cost-effective replacement for essential maintenance.
– Wide compatibility with multiple Subaru models and years.
– Tested for reliability to ensure proper function.

Cons:
– Requires careful installation, often within the fuel pump assembly.
– Not a performance upgrade, purely a maintenance item.

Best for: Subaru STI owners looking for a reliable, tested aftermarket fuel pump filter for their 2008-2018 models as part of their regular maintenance schedule or during a fuel pump replacement.

User feedback summary: Owners find this filter to be a good value for money, fitting correctly and performing its essential filtering function effectively. They often mention replacing it alongside their fuel pump for complete fuel system refresh.

9. KEMSO 340LPH High Performance Fuel Pump for Subaru/Honda…

This is another listing for the highly capable KEMSO 340LPH High Performance Fuel Pump, reinforcing its position as a top choice for modified Subaru STIs. Like the previous KEMSO entry, it’s engineered to support up to 600 BHP, making it an excellent upgrade for boosted applications and E85 conversions. The consistency of features across multiple listings highlights KEMSO’s commitment to a specific, high-quality product. Its bypass valve set at 125.8psi provides better performance characteristics than many lower-rated pumps, and the lifetime warranty with USA-based support continues to be a major selling point for those investing in their STI’s performance.

• Performance: Supports up to 600 BHP (N/A, Turbocharged, Supercharged).
• Fuel Compatibility: Designed for gasoline or E85.
• Bypass Valve: Set at 125.8psi.
• Warranty: Serialized fuel pump body guarantees Lifetime warranty, USA-based support.

Pros:
– Exceptional flow rate for very high-horsepower builds.
– Fully E85 compatible, allowing for flexible tuning.
– Robust construction and higher bypass pressure for consistent performance.
– Industry-leading lifetime warranty and responsive USA-based support.

Cons:
– Installation requires expertise and likely fuel system modifications beyond just the pump.
– Overkill for stock or lightly modified STIs.

Best for: Subaru STI owners committed to pushing big power, running E85, or building a competition vehicle, who need a high-flow pump backed by a serious warranty and support.

User feedback summary: This pump earns high marks for its reliability under extreme conditions and its capability to deliver consistent fuel pressure for highly tuned engines. The lifetime warranty is frequently praised as a key differentiator.

10. KEMSO 340LPH High Performance Fuel Pump for Subaru/Honda…

Yes, another KEMSO 340LPH! This simply underscores how popular and reliable this particular model is in the aftermarket performance scene. For Subaru STI owners, this means consistent availability and a proven track record. It again features the ability to support up to 600 BHP, making it a go-to for enthusiasts looking to max out their STI’s power potential. Its E85 compatibility is a huge benefit for those chasing high octane and cooler combustion temperatures. The robust design, high bypass valve setting, and crucially, that lifetime warranty with USA support, mean you’re investing in a pump that’s built to last and backed by a company that stands behind its product.

• Performance: Supports up to 600 BHP (N/A, Turbocharged, Supercharged).
• Fuel Compatibility: Designed for gasoline or E85.
• Bypass Valve: Set at 125.8psi.
• Warranty: Serialized fuel pump body guarantees Lifetime warranty, USA-based support.

Pros:
– Massive flow capacity for extreme power levels.
– Full E85 compatibility, a must for many high-performance builds.
– Superior build quality indicated by high bypass pressure.
– Unbeatable lifetime warranty with accessible US-based customer service.

Cons:
– Significant installation effort, typically part of a larger fuel system overhaul.
– Not necessary for a stock STI and could potentially cause issues without proper tuning.

Best for: Subaru STI owners who demand the absolute best in high-flow, E85-compatible fuel delivery for their high-horsepower, track-focused, or heavily modified builds, valuing long-term reliability and support.

User feedback summary: Repeatedly, users confirm its robust performance and reliability in demanding applications. The lifetime warranty is a recurring theme in positive feedback, providing immense value to long-term performance builds.

Helpful Comparison Insights

When looking at the best fuel pumps for Subaru STI, we’ve essentially got two main categories here: OEM-style replacements and high-performance upgrades, plus the ever-important fuel filters.

For those who own a stock or lightly modified STI and just need to replace a failing pump with something reliable and factory-spec, the A-Premium Electric Fuel Pump Module Assemblies (Product 1 & 2) are excellent choices. They offer a complete, direct-fit solution, including the sending unit, making installation straightforward. They’re designed to restore your STI’s original fuel delivery performance, not to add extra horsepower. They also come with a one-year warranty, which is a nice touch for peace of mind. The key difference between the two A-Premium units is their specific model year compatibility, so make sure to pick the one that fits your STI’s generation.

Now, if you’re pushing serious power in your STI – we’re talking big turbo, E85, or other major engine modifications – then you’ll need a high-performance fuel pump. The QFS-344FT-1008 Performance 340LPH Fuel Pump (Product 3) and the KEMSO 340LPH High Performance Fuel Pumps (Products 6, 9, 10) are directly comparable. Both are rated for up to 600 BHP, offering a significant increase in fuel flow over stock. The KEMSO units specifically highlight E85 compatibility and a lifetime warranty with USA-based support, which are huge advantages for performance builders. The QFS also offers a lifetime warranty and easy drop-in installation. Both will require tuning to correctly support your setup, but they provide the necessary fuel volume.

Stepping up from just a pump to a complete module, the Deatschwerks X2 Series Fuel Pump Module (Product 7) is a premium option. While it also offers high performance, its major benefit is being a complete, pre-assembled module. This means it’s often a more straightforward installation than installing just a pump into your existing hanger, and you’re getting a top-tier brand’s engineered solution. It’s a fantastic choice if you want the best performance and convenience in a single package.

Finally, we have the fuel pump filters from GETOPAUTO (Product 4), Subaru NEW (Product 5), and TCINDRR (Product 8). It’s crucial to understand these are not fuel pumps, but essential companions to any fuel pump. Whether you’re running a stock pump or a high-performance unit, these filters protect your entire fuel system from harmful contaminants. They are particularly important for prolonging the life of your fuel pump and preventing injector clogs. All three filters are designed for wide compatibility with 2008-2018 STIs and are vital maintenance items. Choosing one of these, particularly during a pump replacement, is non-negotiable for system longevity. They vary slightly in brand, but all serve the same critical purpose.

Consider flow rate versus your power goals: A stock STI doesn’t need a 340LPH pump, and a 600hp STI will quickly starve with an OEM replacement. Budget also plays a role, with performance modules typically costing more than just a pump, and OEM-style replacements being more accessible. Warranty and support are also key, especially for performance parts where reliability under stress is paramount.

Final Verdict

Choosing the best fuel pump for your Subaru STI really boils down to your car’s current state and your future power goals.

If your STI is a daily driver that’s mostly stock or has light modifications, and you’re experiencing fuel delivery issues, the A-Premium Electric Fuel Pump Module Assemblies (Products 1 & 2, depending on your year) are your go-to. They offer a comprehensive, direct-fit solution that restores factory reliability without breaking the bank. Think of them as the perfect remedy for a tired, original pump.

For the enthusiast pushing serious horsepower or running E85, you absolutely need a high-performance pump. Here, the KEMSO 340LPH High Performance Fuel Pumps (Products 6, 9, 10) stand out as my top recommendation. Their E85 compatibility, robust design, and especially the lifetime warranty with USA support, make them an incredibly appealing package for highly modified STIs. The QFS-344FT-1008 (Product 3) is a very strong alternative, also offering 340LPH and a lifetime warranty. For those who want the absolute best and prefer a complete, integrated solution from a renowned brand, the Deatschwerks X2 Series Fuel Pump Module (Product 7) is an excellent investment, offering superior engineering and ease of installation in a module format.

And regardless of which pump you choose, never, ever forget the fuel pump filter. The GETOPAUTO (Product 4), Subaru NEW (Product 5), and TCINDRR (Product 8) filters are all critical for protecting your investment. They might not add horsepower, but they prevent costly failures and ensure your entire fuel system runs cleanly and efficiently. Seriously, replace that filter!

Ultimately, for a balanced approach for a moderately modified STI, a high-flow pump like the KEMSO 340LPH is a fantastic sweet spot. For pure, uncompromised performance and ease of install, the Deatschwerks module takes the crown. For stock reliability, the A-Premium units are excellent. And for long-term peace of mind, any of the listed fuel filters are non-negotiable.

Comprehensive FAQ Section

Q1: Why is upgrading my Subaru STI’s fuel pump important, especially with modifications?
A: Your stock Subaru STI fuel pump is designed to support factory horsepower levels. When you add performance modifications like larger turbos, bigger injectors, or run E85 fuel, the engine demands significantly more fuel. An upgraded fuel pump ensures a consistent, sufficient supply of fuel at the correct pressure, preventing dangerous lean conditions that can lead to engine damage. It’s a foundational upgrade for any serious power increase.

Q2: How do I know if my Subaru STI fuel pump is failing?
A: Common signs of a failing fuel pump include difficulty starting, engine sputtering or hesitating under acceleration (especially at high RPMs or boost), a noticeable loss of power, a whining noise coming from the fuel tank area, or a sudden decrease in fuel economy. If you suspect issues, it’s best to get your fuel pressure checked professionally.

Q3: Can I install a high-performance fuel pump in my stock Subaru STI?
A: While physically possible, it’s generally not recommended without proper tuning. A high-flow pump in a stock STI can lead to excessively high fuel pressure, potentially causing rich conditions, poor fuel economy, and could even overwhelm your stock fuel pressure regulator. High-performance pumps are best paired with other modifications and a custom tune to ensure optimal and safe operation.

Q4: Is E85 fuel compatible with all upgraded Subaru STI fuel pumps?
A: Not all, but many high-performance fuel pumps are indeed designed to be E85 compatible, like the KEMSO 340LPH pumps we reviewed. E85 (ethanol) is corrosive to certain materials found in older or non-compatible fuel system components. Always check the product specifications to ensure the fuel pump, lines, and injectors are rated for E85 use before making the switch.

Q5: How often should I replace the fuel filter in my Subaru STI?
A: Subaru generally recommends replacing the fuel filter every 30,000 to 60,000 miles, but this can vary based on your driving conditions and fuel quality. If you live in an area with questionable fuel, or if you’ve recently replaced your fuel pump, it’s a good idea to replace the filter to protect your new components. It’s a relatively inexpensive part that offers significant protection for your entire Subaru STI fuel system.

Q6: What’s the difference between a fuel pump and a fuel pump module assembly?
A: A “fuel pump” typically refers to just the electric pump motor itself. A “fuel pump module assembly” is a complete unit that includes the fuel pump, the fuel sending unit (which measures fuel level), the fuel strainer, and often the fuel pressure regulator, all housed within a single plastic hanger designed to drop directly into your fuel tank. Assemblies are generally easier to install as a complete unit.

Q7: Should I attempt to install a fuel pump myself or have a professional do it?
A: Installing a fuel pump, especially in a Subaru STI, can be a complex task involving handling flammable fuel and working with electrical connections. While some DIY enthusiasts might tackle it, if you’re not experienced, it’s highly recommended to have a professional mechanic perform the installation. Improper installation can lead to fuel leaks, electrical issues, or even fire hazards. Additionally, performance fuel pump installations often require a custom tune, which a professional shop can provide.