EVIL ENERGY External Inline Fuel Pump 300 LPH 12V, High‑Flow EFI Pump, Universal Fit with Hardware

EVIL ENERGY's External Inline Fuel Pump is a compact 12V high-flow pump delivering up to 300 LPH for EFI systems, engineered for reliable fuel delivery across petrol and diesel applications.

This external inline unit is built for vehicles and custom fuel systems that need a consistent, high-volume feed at a wide range of temperatures. The pump is rated for multiple test-flow points and supports common fuels—offering a versatile option for aftermarket installations where a durable, serviceable pump is required. It arrives with installation hardware and adapters to simplify mounting below the fuel tank, promoting gravity-assisted feed.

How much flow and pressure can I expect from this pump?

The EVIL ENERGY pump offers measured flow outputs that vary with operating voltage and backpressure, making it suitable for many EFI setups. It’s performance-tested at typical voltages to help match system requirements without guesswork.

• 300 LPH measured at 43 PSI with 13.5V input
• 255 LPH measured at 43 PSI with 12V input
• 200 LPH measured at 75 PSI with 12V input
• Continuous operating pressure capability up to 75 PSI

Which fuels is the pump compatible with and what temperatures will it tolerate?

This inline pump is compatible with a broad range of liquid fuels commonly used in performance and everyday vehicles. It’s engineered to operate through extreme cold and high-heat conditions so it fits many climates and use cases.

• Works with gasoline, pump gas, race fuels and diesel
• Operating temperature range from -68°F up to 194°F
• Sealed design to withstand road and underbody environments

How do I install the pump and what comes in the box?

EVIL ENERGY recommends mounting this external pump below the fuel tank to maintain a gravity-fed inlet for reliable priming. The unit ships with adapters and mounting hardware so most installations require minimal additional parts.

• Includes inlet 10AN and outlet 6AN adapters for common hose fittings
• Supplied hardware: gaskets, washer, nuts and insulated terminals
• Two rubber connection covers and a user manual for step-by-step guidance

Will this work with my vehicle’s electrical system and EFI setup?

The pump runs on 12V DC and is designed specifically for electronic fuel injection systems. Ensure your wiring, relay and fuse sizing meet the pump’s current draw and that the fuel line and filters are sized to match the flow capacity.

• Intended for 12V DC EFI use—verify electrical capacity before installation
• Recommended to use an in-line fuse and relay for safe operation
• Install below the tank for best priming and longevity

Who is this for? The EVIL ENERGY 300 LPH External Inline Fuel Pump suits hobbyists, tuners and professional installers who need a compact, serviceable pump for aftermarket EFI conversions, performance upgrades or replacement of worn external pumps. It’s a good choice when you need predictable flow at elevated pressures, broad fuel compatibility, and a rugged operating temperature range without changing the factory fuel-supply layout.