Early Bronco Fuel Pumps

Early Bronco Fuel Pumps: Mechanical vs Electric Upgrade Options

All 1966-77 Ford Broncos came from the factory with carbureted engines using a mechanical fuel pump mounted on the driver side of the engine. This pump supplied fuel directly to the carburetor and worked well for stock applications.

If you’re replacing that factory setup with an electric fuel pump—either for reliability or to support EFI—you’ll need to install a fuel pump block-off plate to seal the opening left behind on the engine.

Once you move away from the stock mechanical pump, you’ll typically choose between a frame-mounted electric pump or an in-tank setup. Each has its own advantages depending on how your Bronco is built and used.

Frame-Mounted Fuel Pump

A frame-mounted fuel pump is installed along the frame rail, ideally as close to the fuel tank as possible.

Pros:

• Easier to install with minimal modifications

• Simple to access for service or replacement

• Lower overall cost compared to in-tank systems

Cons:

• Can be louder since it’s not insulated by fuel or the tank

• Some claim they don’t perform as well when pulling fuel from an empty tank, though this isn’t always an issue in real-world use

In-Tank Fuel Pump

An in-tank fuel pump is mounted inside the fuel tank and requires a tank designed to accommodate the pump.

Pros:

• Reduced risk of fuel starvation, especially in low fuel conditions

• Quieter operation due to being submerged and insulated

• Runs cooler, which can improve longevity

Cons:

• Requires a specific fuel tank, increasing cost

• More involved installation

• Harder to service, often requiring tank removal unless an access panel is added

There’s no one-size-fits-all answer when it comes to choosing the right setup. Whether you stick with a stock-style mechanical pump or upgrade to an electric system, the best choice depends on your budget, engine setup, and how you use your Bronco.