Holley Mighty Mite 12-427 32 GPH Electric Fuel Pump, 4–7 PSI, 12V Solid-State

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

Built by Holley Performance Products, this Mighty Mite pump is designed for racers, restorers, and street-driven projects that need a simple, self-priming fuel delivery solution. It combines a solid-state motor with a practical flow rate and pressure window, and it’s compatible with a wide range of fuels and additives so you can run gasoline, ethanol blends, diesel, or alcohol mixes without special modifications.

How does the 12-427 perform for everyday and performance use?

The pump provides a steady 32 GPH flow and maintains 4–7 PSI operating pressure—settings that suit many street and light performance engines. Its solid-state design reduces wear and extends service life compared with older mechanical units. The 12V operation and simple two-wire hookup make installation straightforward for most builds.

• 32 gallons per hour flow for consistent fuel supply
• 4–7 PSI operating range for carbureted and fuel-injected setups within its design limits
• Solid-state construction for quieter, longer-lasting operation
• Simple two-wire electrical connection for fast installation

Can the Holley Mighty Mite handle different fuels and additives?

Yes—the 12-427 is compatible with gasoline, diesel, ethanol blends including E85, and many fuel additives commonly used in performance environments. That broad compatibility helps avoid compatibility issues when switching fuels or testing higher-octane blends. However, it is not intended for aircraft use.

• Safe for gas, ethanol blends, diesel, and many additives
• Works with E85 and blended alcohol fuels without modification
• Not certified or recommended for aviation applications

What installation and fit details should I expect?

The pump runs on 12 volts with a straightforward two-wire hookup and is self-priming, simplifying plumbing and electrical work. It can deliver fuel at up to a 12-inch dry lift, which helps with placement in many aftermarket and retrofitted systems. Because it’s designed for up to roughly 400 HP in naturally aspirated engines, check your vehicle’s fuel demand against the pump’s specs before selecting it for high-output forced-induction setups.

• 12V electrical system with two-wire connection
• Self-priming and capable of 12" dry lift for flexible mounting
• Recommended for up to about 400 HP naturally aspirated engines
• Compact footprint works in tight engine bays or custom mounts

Who is this for?

The Holley 12-427 Mighty Mite suits hobbyists rebuilding street cars, hot-rodders updating classic fuel systems, and weekend racers needing a reliable, easy-to-install external pump that accepts modern fuel blends. It’s best for naturally aspirated engines within the pump’s flow and pressure range, and for anyone who wants a low-complexity, long-lived electric pump that integrates into conventional fuel setups.

Key specifications: 12 volt operation; 32 GPH flow; 4–7 PSI operating pressure; solid-state design; compatible with gas, diesel, alcohol blends, and E85; simple two-wire hookup; self-priming; 12" dry lift capable; suited for up to ~400 HP naturally aspirated applications.