GSS315 255L/Hr Fuel Pump: A Complete Guide for High-Performance Upgrades
What Is the GSS315 255L/Hr Fuel Pump?
The Walbro GSS315 is a high-output, in-tank fuel pump that fits most common EFI applications. It is built by TI Automotive, the company behind the Walbro brand, which has been manufacturing fuel pumps for over 60 years. The GSS315 is a universal pump, meaning it can be used in a wide range of vehicles, from Japanese imports to American muscle cars. It is a direct replacement for many factory fuel pumps and is often used when upgrading to support higher horsepower levels.
Key specifications include:
- Flow rate: 255 liters per hour at high pressure, 190 liters per hour at low pressure
- Max pressure: 50 psi
- Horsepower support: 300 to 550 horsepower on gasoline
- Pump body size: 39 mm
- Internal check valve: Yes
- Fuel type: Gasoline (not E85 compatible)
This pump is known for its reliability and ease of installation. It is commonly used in vehicles like the Acura NSX, Ford Probe GT, Mazda RX-7, Toyota Supra, and Nissan 240SX, among others.
Why Choose the GSS315 for Your Build?
- High flow capacity: The 255 LPH rating means this pump can deliver enough fuel for engines producing up to 500 horsepower, making it ideal for street and track cars.
- Proven reliability: Walbro fuel pumps are the industry standard for performance applications. They are manufactured in the USA and have a long track record of dependable service.
- Easy installation: The pump comes with a universal fitment, and many vehicles have direct-fit kits available. Most installations can be done with basic hand tools.
- Cost-effective: Compared to other high-performance pumps, the GSS315 offers a great balance of price and performance. It is often priced under $120, making it an affordable upgrade.
Important Considerations Before Buying
Before purchasing a GSS315, there are a few things to keep in mind:
- Warranty: TI Automotive does not provide a warranty on their high-performance pumps. This is standard for aftermarket performance parts, so you should buy from a reputable dealer to ensure you get a genuine product.
- Counterfeit risk: There is a high rate of counterfeit Walbro pumps on the market. Always buy from an authorized dealer or a trusted source. Genuine pumps will have the TI Automotive logo engraved on the body.
- Fuel compatibility: The GSS315 is designed for gasoline only. If you plan to run E85 or other ethanol blends, you should look for a pump specifically rated for that fuel, such as the Walbro 450LPH E85 version.
- Installation kit: While the pump itself is universal, you may need a separate installation kit for your specific vehicle. Many retailers sell kits that include the necessary wiring, hoses, and mounting hardware.
Common Applications for the GSS315
The GSS315 fits a wide range of vehicles, including:
- Acura NSX (1991-2000)
- Ford Probe GT (1989-1992)
- Mazda MX-6 (1988-1992)
- Mazda RX-7 (1986-1991)
- Toyota MR2 (1991-1995)
- Toyota Supra (1986-1992)
- Nissan 240SX, Silvia, and 180SX (1988-1993)
This pump is also a popular upgrade for many Honda, Ford, and Mazda models. Always check compatibility with your specific year, make, and model before ordering.
A Better Alternative: KEMSO High-Performance Fuel Pumps
While the Walbro GSS315 is a solid choice, there is a newer option on the market that offers even better performance and value. KEMSO fuel pumps are designed to meet or exceed OEM specifications and are built for high-performance applications. They are a direct replacement for Walbro 255LPH pumps like the GSS315, but with key improvements.
KEMSO Fuel Pumps offer:
- High flow rate: Up to 340 LPH, supporting up to 600 BHP
- Lifetime warranty: Every KEMSO pump comes with a lifetime warranty, giving you peace of mind
- USA-based support: Technical support is provided by USA-based technicians
- Fuel compatibility: Works with both gasoline and E85
- High-pressure bypass valve: Set at 125.8 psi, higher than the GSS series, for superior fuel delivery under boost
- OEM replacement: Designed to fit a wide range of vehicles, including Subaru, Honda, Nissan, and many others
If you are looking for a fuel pump that offers more power, better reliability, and a lifetime warranty, KEMSO is a smart choice. You can browse their full range of performance and OEM replacement fuel pumps at https://www.kemsoracing.com/.
Installation Tips for the GSS315 or Any Aftermarket Fuel Pump
Installing a fuel pump is a straightforward job, but it requires careful attention to safety and cleanliness. Here are some tips to ensure a successful installation:
- Safety first: Work in a well-ventilated area, and keep a fire extinguisher nearby. Disconnect the battery before starting.
- Clean the tank: Remove any debris or sediment from the fuel tank before installing the new pump. A dirty tank can cause the pump to fail prematurely.
- Replace the filter: Always replace the fuel filter and the strainer on the pump inlet at the same time. A clogged filter is a common cause of pump failure.
- Check the wiring: Use the correct gauge wire and secure all connections. Poor wiring can cause voltage drops and reduce pump performance.
- Test the system: After installation, turn the key to the "on" position (without starting the engine) to prime the system. Check for leaks and verify fuel pressure with a gauge.
Final Thoughts
The GSS315 255L/Hr fuel pump is a proven workhorse in the performance world. It delivers reliable fuel flow for up to 500 horsepower and fits a wide range of vehicles. However, if you want a pump that offers higher flow, better fuel compatibility, and a lifetime warranty, consider upgrading to a KEMSO fuel pump. Both options are excellent for their respective price points, but KEMSO provides extra value for serious performance builds.
For more information and to find the right fuel pump for your vehicle, visit https://www.kemsoracing.com/ today.