EVIL ENERGY 300LPH High Flow External Inline Fuel Pump Kit Universal 12V with Pressure Regulator

Q: What is included in the EVIL ENERGY 300LPH external inline fuel pump kit?
A: The kit includes one 300LPH external inline fuel pump, one 60 mm mounting bracket, one adjustable 20–120 PSI fuel pressure regulator, one 100-micron pre-filter, one 10-micron post-filter, one AN6-to-3/8 inch aluminum line fitting kit with 25FT aluminum tubing, one M12×1.5-to-AN6 adapter, and one AN6-to-M18×1.5 adapter.

Q: Is this a complete vehicle-specific fuel system?
A: No. This is a universal-style custom EFI fuel pump kit. Vehicle-specific tank fittings, fuel rail connections, return-line hardware, relay, fuse, wiring, injectors, and additional adapters may still be required.

Q: What is the published flow of the 300LPH external fuel pump?
A: The published test points are 300 LPH at 43 PSI and 13.5V, 255 LPH at 43 PSI and 12V, and 200 LPH at 75 PSI and 12V.

Q: Does the pump deliver 300 LPH at every pressure?
A: No. The 300LPH rating applies to the listed 43 PSI and 13.5V test point. Delivered flow changes with operating pressure, voltage at the pump, wiring, filtration, line restriction, fittings, regulator setup, and fuel type.

Q: What is the maximum operating pressure?
A: The listed maximum operating pressure is 75 PSI. Confirm that the pump flow at the required pressure is sufficient for the complete EFI system.

Q: Can this pump be used for an LS swap?
A: It can be used as an LS swap inline fuel pump when the required fuel flow, pressure, regulator type, feed and return layout, fittings, and electrical system are compatible. It is not a plug-and-play LS-specific kit.

Q: Where should the external inline fuel pump be mounted?
A: Mount the pump close to the fuel tank and at or below the tank outlet when the vehicle layout permits a safe gravity-fed installation. Keep it away from exhaust heat, moving parts, road debris, and direct impact.

Q: Why are two fuel filters included?
A: The 100-micron filter is intended for pre-pump filtration, while the 10-micron filter provides finer post-pump filtration before fuel reaches the regulator, fuel rail, or injectors.

Q: Which direction should the fuel filters be installed?
A: Install each filter according to the flow-direction arrow on its housing. The 100-micron filter should be placed before the pump and the 10-micron filter after the pump in a compatible EFI layout.

Q: What is the adjustment range of the fuel pressure regulator?
A: The included regulator has a listed adjustment range of 20–120 PSI. Set base pressure according to the injectors, fuel rail, engine-management system, and return-style fuel-system requirements.

Q: Does the regulator require a return line?
A: The regulator should be installed according to its port layout and return-style operating requirements. Confirm that the return line and tank connection can carry excess fuel flow.

Q: What are the aluminum fuel line dimensions?
A: The included 1060-grade aluminum line is 25FT long with a 3/8 inch outer diameter, 0.32 inch inner diameter, and 0.05 inch wall thickness.

Q: Are the included M12×1.5 and M18×1.5 adapters compatible with every vehicle?
A: No. These adapters match the listed pump-side connection requirements, but vehicle-side tank, regulator, rail, or factory hard-line connections must be checked separately.

Q: What fuels are listed as compatible?
A: The current specification lists gasoline and diesel, with oil-gas separation required for diesel applications. The page does not confirm methanol or ethanol compatibility for the complete kit.

Q: Is this the same as an EVIL ENERGY 044 fuel pump?
A: The term “044” is often used as a search reference for this external pump style, but interchangeability should not be assumed. Verify dimensions, threads, electrical requirements, pressure, and published flow before replacing another pump.

Q: Can horsepower support be estimated from the 300LPH rating?
A: Not accurately from the nominal LPH rating alone. Required fuel flow also depends on fuel type, base pressure, boost, injector duty cycle, engine efficiency, voltage, and total system restriction.

Q: What electrical parts may still be required?
A: A suitable relay, fuse, power wire, ground, connector, and vehicle-specific wiring hardware may be required. Verify voltage at the pump while it is operating.

Q: What should be checked before ordering?
A: Confirm required flow at operating pressure, available pump voltage, regulator range, return-line capacity, filter placement, fuel compatibility, aluminum line size, adapter threads, mounting space, and the exact package contents.

Q: What should be checked after installation?
A: Prime the system, verify pump voltage and fuel pressure, inspect every connection for leaks, and confirm that the pump, filters, regulator, and fuel line remain clear of heat, sharp edges, suspension movement, and drivetrain components.

Q: Is professional installation recommended?
A: Professional installation is recommended when custom fuel-system design, hard-line routing, return-line plumbing, pressure adjustment, or electrical wiring is outside the installer’s experience.

Q: What is an inline fuel pump?

A: An inline fuel pump is an external 12V Electric Fuel Pump that mounts along the fuel line outside the tank. Compared to in-tank pumps, it’s easier to install, service, and replace. For high-flow EFI systems, an External Fuel Pump ensures reliable fuel delivery, preventing fuel starvation, pressure drops, and inconsistent flow under load.

Q: Is the EVIL ENERGY 300LPH fuel pump universal?

A: Yes. This Universal Inline Fuel Pump is designed for most vehicles requiring a 12V EFI system. It’s flexible for different makes and models, but vehicle-specific fitting requirements should be checked before installation.

Q: What types of fuel can this pump handle?

A: This pump supports gasoline, race gas, ethanol, and diesel (with oil-gas separation). Its alloy steel construction allows it to act as a Diesel Inline Pump, making it suitable for performance or high-demand fuel systems.

Q: How much fuel flow does this pump provide?

A: It delivers 300LPH at 43 PSI / 13.5V, with a maximum operating pressure of 75 PSI. This ensures stable fuel flow for high-performance engines and prevents power loss due to fuel starvation.

Q: How should I install this external fuel pump?

A: Mount it below or near the fuel tank for a gravity-fed supply. Follow the included instructions carefully. Proper installation prevents cavitation, airlocks, and ensures consistent flow for your Universal Inline Fuel Pump.

Q: Do I need additional fittings?

A: The pump comes with a 10AN (M18x1.5) and a 6AN (M12x1.5) fitting. These provide secure, leak-proof connections for most EFI setups, so additional adapters are usually unnecessary.

Q: Is this pump noisy compared to in-tank models?

A: External pumps can be slightly louder, but the EVIL ENERGY pump is engineered to minimize vibration. Using rubber isolators during installation further reduces noise while protecting the pump.

Q: Do I need a fuel filter?

A: Yes. A 100-micron pre-pump filter is recommended to protect the pump from debris. Proper filtration ensures long-lasting, high-flow performance for EFI systems.

Q: What warranty does EVIL ENERGY provide?

A: This pump comes with a 6-month warranty. Customer support and a 180-day return policy help ensure peace of mind for normal use.

Q: What is the current draw and do I need a relay?

A: The pump draws 10–13A at 43 PSI. Use a 30A–40A relay and 10–12 gauge wiring to prevent voltage drop and ensure stable operation.

Q: How does it handle vapor lock or overheating?

A: Its alloy steel body and precision internals dissipate heat efficiently. Keep it away from exhaust heat and follow proper installation to avoid vapor lock or performance drops.

Q: Can it be used with PWM controllers?

A: It’s best used with a standard 12V-13.5V relay-triggered system for maximum stability. If using PWM, ensure the controller supports high current for 300LPH Fuel Pump operation.