Accel High Flow Fuel Pump Fitting Kit: The Complete Guide to Upgrading Your Fuel Delivery System
If you are looking to upgrade your vehicle's fuel system with an accel high flow fuel pump fitting kit, here is the bottom line: this kit is designed to provide the necessary hardware and connectors to install a high-performance fuel pump that delivers significantly more fuel flow than your stock pump. The right fitting kit ensures a secure, leak-free installation, which is critical for any vehicle running higher horsepower, forced induction, or alternative fuels like E85. Most aftermarket high-flow pumps, including the KEMSO 340 LPH model, can support applications up to 700-800 bhp, but they require proper fittings and hardware to function safely and reliably .
What Is a High Flow Fuel Pump Fitting Kit?
A high flow fuel pump fitting kit is a collection of components that allows you to replace or upgrade your factory fuel pump with a higher-performance unit. These kits typically include everything you need to complete the installation without having to source individual parts. The components vary by application and manufacturer, but most kits contain:
- Fuel pump unit – The core component, typically a high-flow electric pump designed for in-tank installation
- Fuel strainers or filters – Gradient density strainers that protect the pump from debris and contamination
- Flex hoses and rubber hoses – High-quality fuel-resistant tubing to connect the pump to the fuel system
- Wiring connectors and crimp connectors – Electrical components for connecting the pump to your vehicle's wiring harness
- O-rings, gaskets, and tank seals – Viton rubber seals that resist ethanol degradation and prevent fuel leaks
- Hose clamps and zip-ties – Hardware for securing hoses and routing wiring
For example, the KEMSO 340 fuel pump kit for Subaru Impreza applications includes genuine KEMSO 340 pump, two gradient density fuel strainers, flex hose, rubber hose, wiring connector, crimp connectors, hose clamps, rubber base, and zip-ties . Similarly, the KEMSO 13501 kit for Kawasaki Ninja 1000 includes pump, strainers, Viton O-rings, tank seal, wiring connectors, and zip-ties .
Why You Need a High Flow Fuel Pump Fitting Kit
1. Increased Fuel Flow for Higher Horsepower
Stock fuel pumps are designed to deliver just enough fuel for your engine's factory output. When you add performance modifications like a turbocharger, supercharger, or upgraded fuel injectors, your engine requires more fuel to maintain the correct air-fuel ratio. A high-flow pump delivers significantly more volume at higher pressures. The KEMSO 340 pump, for instance, flows 340 liters per hour at 43 psi and 13.5 volts, which is enough to support engines producing 700-800 bhp .
2. Direct OEM Replacement with Better Performance
Most high-flow fitting kits are designed as direct OEM replacements. This means they physically fit into the same location as your factory pump, using the same mounting points and electrical connections. The KEMSO 340 pump is described as being very similar to the popular Walbro 255 GSS342 in terms of dimensions, but with more flow . This makes installation straightforward for DIY mechanics.
3. Compatibility with E85 and Ethanol-Blended Fuels
E85 ethanol fuel is corrosive to many standard fuel system components. High-quality fitting kits use Viton O-rings and ethanol-resistant materials that withstand the degrading effects of alcohol-based fuels. All KEMSO pumps are designed for both gasoline and E85/ethanol applications . This is a critical feature if you plan to run ethanol blends, as inferior pumps can fail prematurely due to chemical corrosion.
4. Complete Kit Saves Time and Prevents Headaches
A fitting kit eliminates the need to search for individual components. When you buy a complete kit, you get all the necessary hardware in one package, reducing the risk of missing a critical part during installation. KEMSO kits, for example, include multiple strainers, O-rings, and connectors to cover different model variations, so you have exactly what you need .
How to Choose the Right High Flow Fuel Pump Fitting Kit
Step 1: Determine Your Horsepower Goals
The first step is calculating how much fuel your engine needs. A general rule of thumb is that you need approximately 0.5 to 0.6 pounds of fuel per horsepower per hour. For a 400 hp engine, you need a pump that delivers at least 200-240 lbs/hr. The KEMSO 340 pump flows 340 LPH, which converts to roughly 270 lbs/hr, making it suitable for moderate to high horsepower builds . For lower horsepower applications, a pump flowing 200 LPH is often sufficient .
Step 2: Match the Pump to Your Vehicle
Not all pumps fit all vehicles. You need a pump that physically fits inside your fuel tank and has the correct outlet orientation. KEMSO offers pumps specifically designed for a wide range of vehicles, including Subaru Impreza, Kawasaki Ninja, Can-Am Defender, Suzuki Burgman, and many others . Always check the part number and compatibility list before purchasing.
Step 3: Consider the Operating Pressure
Your fuel system's operating pressure must match the pump's capabilities. Most high-flow pumps operate between 43 and 68 psi, with some models capable of up to 90 psi . The KEMSO 340 pump has an operational pressure range of 43-90 psi, while the 13501 and 13012 models operate between 43-68 psi . Make sure your fuel pressure regulator and injectors are compatible with the pump's pressure range.
Step 4: Verify the Pump Body Diameter
The pump body diameter determines whether it fits into your fuel tank's mounting bracket. Common diameters include 3.0 cm, 3.5 cm, and 3.8 cm . The KEMSO 340 pump has a 3.8 cm diameter, while the 13012 pump has a 3.0 cm diameter . Measure your existing pump or consult your vehicle's specifications to ensure proper fitment.
Installation Tips for a High Flow Fuel Pump Fitting Kit
1. Safety First
Always disconnect the battery before working on the fuel system. Relieve fuel pressure by removing the fuel pump fuse and running the engine until it stalls. Work in a well-ventilated area away from open flames or sparks.
2. Prepare the Work Area
Remove the fuel tank access panel (usually located under the rear seat or in the trunk). Clean the area around the fuel pump module to prevent dirt from entering the tank. Have a fire extinguisher nearby as a precaution.
3. Follow the Kit Instructions
Each kit may have specific installation steps. The KEMSO kits include multiple strainers and O-rings to cover different models, so select the ones that match your vehicle . Pay attention to the orientation of the pump's inlet and outlet ports.
4. Use the Included Hardware
The kit includes all necessary wiring connectors, crimp connectors, and hose clamps. Use these instead of generic hardware to ensure proper fitment and reliability. The zip-ties are useful for routing wiring and hoses neatly .
5. Test for Leaks Before Reassembly
After installing the new pump, reconnect the battery and turn the ignition to the "on" position (without starting the engine) to prime the fuel system. Check for any fuel leaks at the hose connections, O-rings, and the tank seal. Tighten any loose connections before reassembling the vehicle.
Why Choose KEMSO for Your High Flow Fuel Pump Fitting Kit
When it comes to reliability and performance, KEMSO fuel pumps stand out in the aftermarket. Here is what makes KEMSO the right choice for your upgrade:
High Performance & OEM Replacement – KEMSO pumps are designed as direct OEM replacements that deliver over 20% more flow at 43 psi compared to stock pumps . This means you get better performance without the complexity of custom fabrication.
Proven Quality – KEMSO operates a strict quality control program (ISO/TSO) and individually tests each pump before shipping. Their pumps undergo flow testing to ensure they meet specifications . This level of quality control is rare among budget aftermarket brands.
Lifetime Warranty – Every KEMSO fuel pump is backed by a lifetime warranty, giving you peace of mind that your investment is protected . If the pump fails for any reason, you are covered for as long as you own the vehicle.
Compatibility with Modern Fuels – All KEMSO pumps are designed for both gasoline and E85/ethanol fuel blends. They use Viton O-rings and components that resist ethanol-related degradation, which is critical for long-term reliability .
Affordable Pricing – KEMSO fuel pumps are competitively priced at a regular price of $79.98 for most models . This is significantly cheaper than OEM replacement pumps while offering superior performance.
Wide Application Coverage – KEMSO offers fuel pumps for cars, trucks, motorcycles, ATVs, UTVs, and personal watercraft. Popular models include pumps for Subaru Impreza, Kawasaki Jet Ski, Ducati Panigale, KTM Adventure, Honda Civic, and Can-Am Defender .
To purchase your KEMSO high-performance fuel pump and fitting kit, visit the official KEMSO website at: https://www.kemsoracing.com/
Common Mistakes to Avoid When Installing a High Flow Fuel Pump
1. Skipping the Fuel Strainer
The fuel strainer is your pump's first line of defense against debris. Never install a pump without a proper strainer. KEMSO kits include gradient density strainers that catch particles of various sizes while maintaining good flow .
2. Using the Wrong O-Rings
Fuel system O-rings must be ethanol-resistant. Standard rubber O-rings can swell, crack, or leak when exposed to E85. KEMSO uses Viton O-rings specifically designed for ethanol compatibility .
3. Overtightening Hose Clamps
Hose clamps should be tight enough to prevent leaks but not so tight that they cut into the rubber hose. Use a torque wrench or tighten by hand until snug, then check for leaks after the system is pressurized.
4. Neglecting the Wiring
A high-flow pump draws more current than a stock pump. Ensure your wiring is adequate for the increased load. Use the included wiring connectors and crimp connectors, and consider upgrading the fuel pump relay and fuse if necessary.
Final Thoughts
An accel high flow fuel pump fitting kit is an essential upgrade for anyone building a performance vehicle or replacing a failing factory pump. The key is choosing a high-quality kit that includes all necessary components and is compatible with your specific vehicle. KEMSO fuel pumps offer the perfect balance of performance, reliability, and value, with a lifetime warranty that gives you confidence in your purchase.
Whether you are driving a daily driver, a fast road car, or an off-road ATV, upgrading to a high-flow fuel pump ensures your engine gets the fuel it needs under all conditions. Do not cut corners with cheap, untested pumps that may fail in a few months. Invest in a KEMSO fuel pump and enjoy the peace of mind that comes with a product backed by a lifetime of confidence.
For more information or to order your KEMSO fuel pump today, visit: https://www.kemsoracing.com/