CarBole 12V Electric Diesel Fuel Pump Super 12D — 5–9 PSI, 35 GPH In‑Tank Booster for Carbureted Engines

CarBole Super 12D is a 12‑volt electric diesel fuel pump delivering 5–9 PSI and 35 GPH for carbureted 4, 6 and 8‑cylinder engines.

This compact, universal pump is built to replace or upgrade carbureted diesel fuel systems. It provides steady low pressure and a reliable flow rate to reduce vapor lock and flooding in older diesel setups, and it doubles as a transfer or booster pump when mounted inside a fuel tank. Note: it’s designed specifically for diesel carburetor systems and not for fuel-injected engines or alcohol blends such as E85.

How does this pump fit into my diesel carbureted engine?

The Super 12D is sized and rated for typical carburetor fuel demands on 4, 6 and 8‑cylinder diesel engines. It mounts within the fuel tank area and connects to standard 5/16" I.D. fuel hose, making installation straightforward on compatible systems.

• Fuel pressure range: 5–9 PSI suitable for carbureted setups
• Flow rate: 35 GPH for consistent supply under load
• 5/16" inlet/outlet fittings fit common hose sizes
• Designed for in‑tank mounting within 12" of the pump

Will this pump prevent vapor lock and improve starting?

By maintaining steady low pressure and consistent flow, the Super 12D reduces the likelihood of vapor pockets that cause vapor lock in older diesel systems. It also helps avoid carburetor flooding by providing a controlled, even fuel delivery.

• Stable 5–9 PSI minimizes fuel vapor formation
• 35 GPH keeps fuel lines filled under varying engine demand
• Works well as a booster to improve delivery in long or elevated runs

How do I install and hook up the CarBole pump?

Installation requires mounting the pump inside or very near the fuel tank, within 12 inches of the tank wall, and connecting 5/16" I.D. fuel hose to the inlet and outlet. Use correct electrical wiring for 12V pumps and secure all fittings to prevent leaks.

• Mount within 12" of the fuel tank for optimal operation
• Use 5/16" I.D. diesel‑rated hose on inlet and outlet
• Wire to a 12V supply with proper fuse and switch per vehicle wiring standards

What are the limitations and what should I avoid?

The Super 12D is not compatible with fuel‑injected engines or corrosive fuels. Avoid using gasoline blends with high alcohol content (E85, ethanol, methanol) or other harsh liquids that can damage internal components. It’s intended for diesel applications only.

• Not for fuel‑injected systems or high‑pressure injection rails
• Do not use with E85, ethanol, methanol, or aggressive solvents
• Ensure hose and clamps are diesel‑rated to prevent deterioration

Who is this for: The CarBole Super 12D is aimed at owners and mechanics of older diesel vehicles with carburetors, hobbyists restoring diesel tractors or marine engines, and anyone needing a compact in‑tank transfer or booster pump for diesel applications. If you have a fuel‑injected setup or require alcohol‑compatible pumps, choose a product specified for those fuels instead.