Holley Mighty Mite 12-426 25 GPH Electric Fuel Pump — Black, 1.5-4 PSI Solid-State

Holley’s 12-426 Mighty Mite is a compact 12V electric fuel pump delivering about 25 gallons per hour at 1.5–4 psi for up to roughly 300 HP naturally aspirated engines.

This lightweight, self-priming pump is engineered for automotive and marine applications where a steady low-pressure fuel supply is needed. With a solid-state design for longer service life and compatibility with gasoline, diesel, E85, and fuel additives, it provides a straightforward two-wire hookup and easy installation. Keep in mind it is not certified for aircraft use.

How reliable is the Mighty Mite for regular street or performance use?

The Holley 12-426 uses a solid-state internal design that reduces wear points and improves longevity compared to older mechanical pumps. It’s intended for continuous duty in everyday driving and can support many naturally aspirated engines up to about 300 horsepower.

• Solid-state internals for reduced mechanical failure
• Rated flow: 25 gallons per hour (gph)
• Operates at a controlled 1.5–4 psi output
• Designed for continuous 12V operation

Will this pump handle different fuel types and additives?

Yes — the 12-426 is compatible with a broad range of fuels, including gasoline, diesel, blended alcohol fuels and E85, plus common fuel additives. Its materials and seals are selected to resist corrosion and breakdown from modern fuel blends.

• Safe for gasoline, diesel, blended alcohol and E85
• Works with typical fuel additives and treatments
• Appropriate for both street and many performance applications

How easy is installation and what are the hookup requirements?

Installation is straightforward: the pump uses standard 1/8-inch NPT female inlet and outlet ports and a simple two-wire electrical connection for power and ground. It is self-priming with up to 12 inches of dry lift, so it suits many retrofit and replacement scenarios.

• 1/8 in NPT female inlet and outlet ports for common fittings
• Simple 2-wire hookup — positive and ground
• Self-priming and capable of 12" dry lift for flexibility
• Compact black housing for easy mounting in tight spaces

What performance limits and precautions should I know?

The pump provides 25 gph at a regulated 1.5–4 psi, making it suitable for naturally aspirated engines up to about 300 HP. It’s not intended for aircraft and should be installed with appropriate wiring protection, correct fittings and secure mounting to minimize vibration and heat exposure.

• Flow rating: 25 gph; pressure: 1.5–4 psi
• Good for up to ~300 HP naturally aspirated engines
• Not certified for aircraft use — do not use on any aircraft
• Install with proper wiring, fuses and fuel-line routing for safety

Who is this for? The Holley 12-426 Mighty Mite is aimed at DIY mechanics, restorers, and performance enthusiasts who need a reliable low-pressure electric fuel pump for carbureted or low-pressure fuel-injection systems. It’s a compact, economical upgrade or replacement option for street cars, classic vehicles, boats, and other applications where a steady 1.5–4 psi supply and 25 gph flow meet system requirements. If your application requires higher pressure, turbocharged or high-horsepower fuel demands, or aviation certification, consider a different pump matched to those specifications.