Upgrading Your Fuel System: What You Need for More Power

Fuel Your Build the Right Way

When chasing more horsepower, the fuel system is often overlooked—until it becomes the bottleneck. Whether you’re adding boost, running E85, or simply pushing your engine to the next level, a proper fuel system upgrade is key to unlocking reliable performance.

Let’s break down the components you need, how they work together, and why a full-system approach is better than piecemeal upgrades.

Why Fuel System Upgrades Matter

Your engine can only make as much power as your fuel system can support. Stock systems are designed with factory tolerances in mind, and adding turbochargers or increasing compression can easily overwhelm them.

Common signs you’ve outgrown your stock setup:

• Lean AFRs under load

• Fuel cut or hesitation at high RPM

• Injector duty cycle maxed out

• Fuel pressure drop at wide-open throttle

Core Components of a High-Performance Fuel System

1. Fuel Pump

   • A high-flow pump ensures you’re delivering enough volume to the injectors.

   • Common upgrades: Walbro 255, DeatschWerks DW300, AEM 340lph

   • Consider external vs. in-tank options depending on your setup.

2. Fuel Injectors

   • Choose based on horsepower goals, fuel type, and injector flow rate.

   • E85 requires roughly 30% more volume than petrol.

3. Fuel Pressure Regulator (FPR)

   • Maintains consistent pressure across the rev range.

   • Essential for tuning and preventing lean conditions.

4. Fuel Rail

   • Upgraded rails improve flow and reduce heat soak.

   • Often required for AN fittings and larger injectors.

5. Fuel Lines and Filters

   • Larger lines reduce restriction. AN-6 or AN-8 braided hose is common.

   • A high-flow inline filter protects your injectors and engine.

Planning for Your Power Goals

Always build your fuel system based on your target horsepower and fuel type. Use online calculators or speak with a tuner to size injectors and pumps correctly.

Example Setup for a 400HP Turbo Build on E85:

• 340lph pump

• 1000cc injectors

• Adjustable FPR

• AN-6 fuel lines with inline filter

🚀 Ready to Upgrade?

Explore high-quality fuel system components designed for motorsport use. From pumps to regulators, we’ve got what you need to stay fed at full throttle.

→ Shop Fuel System Components