Holley Mighty Mite 12-427 Electric Fuel Pump 32 GPH, 4–7 PSI — 12V, ethanol-safe

Holley 12-427 Mighty Mite is a compact 12V electric fuel pump delivering 32 gallons per hour at 4–7 PSI for up to 400 HP naturally aspirated applications.

Built by a brand known for performance parts, the Holley 12-427 Mighty Mite electric fuel pump is a straightforward, rugged choice for street and race engines that need reliable fuel delivery. Its solid-state internals are designed for long life, and the pump accepts modern fuel blends including ethanol and E85. The unit is self-priming, supports a simple two-wire installation, and is capable of a 12-inch dry lift for flexible mounting.

How much flow and pressure does this pump provide?

The Mighty Mite 12-427 is rated for 32 gallons per hour and maintains an operating pressure between 4 and 7 PSI, making it suitable for many carbureted and low-pressure EFI systems. That balance of flow and pressure helps ensure steady fuel delivery under moderate loads while keeping system demands simple.

• 32 GPH continuous flow rate
• 4–7 PSI operating pressure range
• Suited for naturally aspirated engines up to about 400 HP

What fuels and environments is the pump compatible with?

This pump is compatible with a wide range of fuels and additives, including pump gas, diesel blends, alcohol mixtures, ethanol, and E85. It is not certified for aircraft use and is intended for automotive and motorsport applications only.

• Works with gasoline, ethanol blends, E85, and compatible additives
• Solid-state design resists wear from modern fuels
• Not for use in aircraft

How easy is installation and what mounting flexibility does it have?

Installation is straightforward with a simple two-wire hookup and no complex plumbing or controllers required. The pump is self-priming and supports up to a 12-inch dry lift, which allows installers to mount it in convenient locations relative to the fuel tank and carburetor or fuel rail.

• Simple two-wire electrical connection
• Self-priming to reduce installation hassle
• Up to 12" dry lift capability for flexible mounting

What durability and performance features should I expect?

Holley engineered the 12-427 with a solid-state internal design that promotes longer service life and dependable operation under typical driving and competition conditions. The pump tolerates modern fuel chemistries and continues to provide stable pressure and flow when properly installed and maintained.

• Reliable solid-state construction for extended life
• Tolerant of modern fuel blends and additives
• Designed for everyday performance and occasional track use

Who is this for: The Holley 12-427 Mighty Mite is aimed at hot-rodders, street restorers, and motorsport enthusiasts who need a compact, dependable electric fuel pump for carbureted or low-pressure EFI engines up to roughly 400 HP. Choose this pump when you want easy installation, broad fuel compatibility, and a proven brand name without the complexity of high-pressure systems.