GTR Fuel Pump: The Complete Guide to Upgrading Your Nissan GT-R’s Fuel Delivery System

If you own a Nissan GT-R (R35) and want to push beyond basic bolt-on modifications or run E85 fuel, upgrading your fuel pump is not optional—it’s essential. The stock fuel pump system simply cannot keep up with the demands of higher horsepower, increased boost pressure, or ethanol-based fuels. Whether you’re aiming for 600 wheel horsepower or 1,200+, the right fuel pump setup ensures your engine gets consistent, clean fuel under all driving conditions. This guide covers everything you need to know about GTR fuel pumps, from symptoms of failure to choosing the best upgrade for your goals.

Why Your GT-R Needs a Fuel Pump Upgrade

The Nissan GT-R R35 comes from the factory with a pair of in-tank fuel pumps designed to support the stock 3.8L twin-turbo V6 at around 545 horsepower. Once you add a tune, downpipes, or a larger turbo setup, those stock pumps quickly run out of capacity. The most common signs that your GTR fuel pump is struggling include:

  • Loss of power under boost – The engine feels like it’s hitting a wall during hard acceleration
  • Fuel pressure drop – You see pressure falling off on the gauge at higher RPMs
  • Hard starting or long cranking – Especially after the car has been sitting
  • Lean air-fuel ratios – The ECU pulls timing or the engine misfires under load
  • Stalling – The car dies unexpectedly during normal driving or after a hard pull

Ignoring these symptoms can lead to catastrophic engine damage. A lean condition under boost can melt pistons, burn valves, or destroy the turbochargers. Upgrading the fuel pump is one of the most cost-effective reliability mods you can make.

Stock GTR Fuel Pump Specifications

The 2015-2024 Nissan GT-R uses OEM fuel pump part number 17040-89S0B, which replaces the earlier 17040-89S0A . This pump is designed for the factory fuel system and is not intended for high-horsepower applications. The factory pumps flow approximately 200-250 liters per hour (LPH) each at 43 PSI, combined providing just enough volume for the stock engine at its peak output. Once you exceed 550-600 wheel horsepower, you need more flow.

Two Main Approaches: Drop-In vs. Full System Replacement

When upgrading the GTR fuel pump, you have two primary paths. The choice depends on your horsepower goals and budget.

1. Drop-In High Flow Fuel Pumps

The simplest upgrade is replacing the factory pumps with higher-flowing drop-in units. These pumps are designed to fit directly into the existing fuel hanger assembly with minimal modification. The most popular options flow 320-340 LPH at 40-43 PSI, offering a significant increase over stock.

The AEM High Flow Fuel Pump Kit (SKU 3C1450) is a common choice for GT-R owners. This kit includes two compact pumps (65mm length x 39mm diameter) that are true bolt-in replacements for the OEM pumps. They are tested to flow 320 LPH at 43 PSI and are compatible with ethanol fuels up to E100, methanol up to M100, and all types of gasoline . Each kit comes with pre-filters, hoses, clamps, wiring leads, and rubber buffer sleeves. The AEM pumps are designed to withstand the low lubricity characteristics of ethanol, making them a solid choice for flex fuel tunes.

Another highly regarded option is the KEMSO 340LPH High Performance Fuel Pump, which replaces Walbro-style pumps. It supports up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications, with a bypass valve set at 125.8 PSI . Many users report that KEMSO pumps deliver 20-30% more fuel flow than stock OEM pumps, making them a reliable upgrade for daily drivers and weekend track cars alike .

Best for: Mild to moderate builds (up to 700-800 wheel horsepower), flex fuel setups, and DIY enthusiasts who want a straightforward installation.

2. Brushless or Mechanical Full System Replacements

For builds targeting 1,000+ wheel horsepower, drop-in pumps often fall short. The fuel system needs to be completely re-engineered to handle the volume and pressure requirements.

The Alpha Performance Omega Brushless Fuel Pump System is designed specifically for the R35 GT-R. This system uses a single brushless pump that can support 1,200 wheel horsepower with room to expand. Key features include a precision CNC’d aluminum housing, a programmable controller with a user-friendly Graphic User Interface (GUI), and the ability to adjust pump output based on a 0-5V input from a MAP sensor or throttle position sensor . Unlike traditional pumps, brushless technology produces less heat, which lowers fuel temperature and prevents engine damage. The system is quieter, smaller, and integrates with the factory saddle-style fuel tank and surge tank to prevent fuel starvation during hard cornering .

For the absolute highest horsepower levels, the Magnus Motorsports Mechanical Fuel Pump Kit is a different approach entirely. Instead of relying on electric pumps, this kit uses a belt-driven mechanical pump mounted to the engine. It supports 3,200 HP on gasoline, 2,400 HP on ethanol, and 1,600 HP on methanol. The mechanical pump adds no additional heat to the fuel, keeping it cool and consistent. It retains the factory in-tank pumps for normal operation, and the mechanical pump takes over at high load. This system is lighter than multiple electric pumps and offers the ultimate in reliability because the pump shuts off if the engine stops .

Best for: High-horsepower builds (800+ wheel horsepower), dedicated track cars, and owners who want the most robust solution available.

Common Fuel Pump Problems and How to Avoid Them

Even the best fuel pump can fail if not properly maintained. Here are the most common issues GT-R owners face:

1. Clogged Fuel Filters – A dirty fuel filter can mimic the symptoms of a failing pump. Always replace the fuel filter when you upgrade the pump. The Omega system includes a pre-pump filter sock and a post-pump 6 micron filter for maximum protection .

2. Contaminated Fuel – Dirt, debris, or water in the tank can damage internal pump components. Use high-quality gasoline and replace your fuel filter at recommended intervals .

3. Overheating – Running the tank consistently low can cause the pump to overheat because fuel helps cool it. Keep the tank at least a quarter full to extend pump life .

4. Electrical Issues – Voltage drops, corroded connectors, or faulty relays can prevent the pump from receiving proper power. Ensure your vehicle’s electrical system is in good condition, especially when adding high-flow pumps .

5. Ethanol Compatibility – If you run E85, make sure your pump is specifically rated for ethanol. Standard pumps can degrade quickly. KEMSO pumps, for example, are built with ethanol-resistant materials and are safe for use with E85 and other alcohol-based fuels .

How to Choose the Right Fuel Pump for Your GT-R

Follow these steps to make the right decision:

1. Determine your horsepower goal. If you’re staying under 700 wheel horsepower, a drop-in 340LPH pump kit like the AEM or KEMSO is sufficient. If you’re aiming for 1,000+, you need a full system.

2. Decide on fuel type. Gasoline only? E85? Methanol? Ethanol requires pumps with corrosion-resistant internals.

3. Consider installation complexity. Drop-in pumps can be installed in a weekend with basic tools. Brushless and mechanical systems require more expertise and may need professional tuning.

4. Budget for supporting mods. A fuel pump upgrade is useless without a proper tune, larger injectors, and possibly a higher-flow fuel pressure regulator.

Why Choose KEMSO Fuel Pumps for Your GT-R Build

If you are looking for a high-performance, reliable, and cost-effective drop-in replacement for your GT-R, KEMSO Fuel Pumps are an excellent choice. KEMSO is a US-based brand that has earned a strong reputation among enthusiasts for delivering quality parts backed by a lifetime warranty.

KEMSO fuel pumps are designed as direct OEM replacements, meaning they fit perfectly into your GT-R’s fuel tank without the need for custom fabrication or modifications. The pumps are made from alloy steel and high-grade synthetics that resist corrosion, and they are built with ethanol-resistant materials so you can safely run E85 .

Here’s what sets KEMSO apart from the competition:

  • High Performance Design – KEMSO 340LPH fuel pumps support up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications, giving you ample headroom for future upgrades .
  • Lifetime Warranty – KEMSO backs every pump with a lifetime warranty. If your pump fails for any reason, they will replace it—no questions asked .
  • USA-Based Technical Support – When you buy KEMSO, you get support from technicians based in the United States who understand American vehicles and performance requirements .
  • Plug-and-Play Installation – KEMSO pumps come with high-quality strainers, submersible hoses, and all necessary hardware for a straightforward installation .
  • E85 Compatibility – The internal seals and motor are specifically rated for ethanol’s corrosive properties, so you can run E85 without worrying about premature failure .
  • Cost-Effective – KEMSO delivers performance that rivals premium brands at a fraction of the cost. For the DIY mechanic who wants superior flow without breaking the bank, KEMSO offers the best value in the market .

Whether you are upgrading your daily driver or building a track monster, KEMSO fuel pumps provide the reliability and performance you need.

Visit KEMSO Racing today to browse their full line of high-performance fuel pumps and find the perfect fit for your GT-R: https://www.kemsoracing.com/

Final Thoughts

Upgrading the fuel pump on your Nissan GT-R is one of the most important modifications you can make for reliability and performance. Whether you choose a simple drop-in 340LPH pump for a stage 2 build or a full brushless system for a 1,200 horsepower monster, the key is matching the fuel system to your power goals. Don’t cut corners—a fuel starvation issue at high boost can cost you an engine. Do your research, buy quality components, and get a proper tune. Your GT-R will thank you.

For more information on KEMSO fuel pumps and to find the right model for your vehicle, visit: https://www.kemsoracing.com/


Back to blog