CarBole External Inline Fuel Pump 12V 300LPH — High‑Flow, With Bracket & Fittings

CarBole Universal 12V external inline fuel pump delivers up to 300LPH flow for EFI gasoline and diesel applications without being installed inside the tank.

Designed for fuel-injected engines that need a reliable, high-flow external pump, this CarBole unit combines a compact footprint with heavy-duty performance. It’s intended for DC 12V EFI systems and is supplied with the fittings and mounting kit to get most installations started quickly. Note that it is not recommended for alcohol/E85 fuels and works best when paired with a pre-filter and mounted below the fuel tank.

How much flow and pressure does this pump produce?

The CarBole pump is rated for a maximum of 300 liters per hour (LPH) at 43 PSI when operating at 13.5V, with measured interim results of 255LPH at 43PSI and 200LPH at 75PSI. Those numbers make it suitable for many higher-horsepower EFI applications that require sustained, high-volume delivery. Performance will vary with voltage, fuel viscosity, and installation layout.

• Max flow: 300LPH at 43 PSI (13.5V)
• Measured flow points: 255LPH @ 43PSI, 200LPH @ 75PSI
• Designed for DC 12V electrical systems
• Best results with stable 12–13.5V supply and in-line pre-filter

What fittings and hardware are included for installation?

CarBole supplies a full basic installation kit so you don’t need to source adapters separately. The pump uses 10AN inlet and 6AN outlet fittings for common aftermarket plumbing, and the package includes a mounting bracket and clamp plus gaskets and terminals. A one-way check valve is included to help maintain system pressure during shutoff.

• 10AN inlet adapter and 6AN outlet adapter included
• Mounting bracket and clamp for external attachment
• One-way check valve, gaskets, nuts, terminals and covers supplied
• Electrical cord marked for correct positive/negative connection

Where should the pump be mounted and what fuel types can it handle?

The manufacturer recommends installing the pump below the fuel tank so fuel is gravity-fed into the inlet, which improves reliability and start-up behavior. This pump is compatible with gasoline and diesel EFI systems but is not advised for alcohol/E85 fuels because those can shorten service life. Always use a pre-filter ahead of the pump to protect the unit from debris and contamination.

• Mount below the fuel tank for gravity feed and stable priming
• Suitable for gasoline and diesel EFI systems only
• Do not use with alcohol/E85 fuels to avoid premature wear
• Install a pre-filter upstream to extend pump life

Who is this pump for? CarBole’s 12V 300LPH external inline fuel pump is aimed at enthusiasts, tuners, and mechanics who need a robust, serviceable pump for upgraded or high-output EFI engines. It’s a practical choice for turbocharged or modified vehicles that require higher flow than stock pumps can deliver, and for projects where an in-tank swap is impractical. Buyers should be comfortable with basic fuel plumbing and electrical wiring and should pair the pump with appropriate filters and fittings for a reliable installation.