Early Bronco Fuel Caps & Covers

Early Bronco Fuel Caps: Styles, Fitment & Identification Guide

If you’re replacing the gas cap on your 1966-77 Ford Bronco, it’s important to understand the differences in factory designs. Early Broncos used multiple styles over the years, and choosing the correct Early Bronco gas cap ensures proper sealing, fitment, and fuel system performance.

Factory Style Gas Caps | 1966-76 Ford Bronco

All 66-76 Ford Bronco fuel caps were mounted on the driver-side rear quarter panel and remained fully visible. These caps measured approximately 3.25 inches in diameter and were typically painted body color to match the Bronco.

Because they were exposed, these Early Bronco fuel caps played both a functional and visual role—sealing the tank while maintaining the original factory look.

Early Bronco Gas Cap Identification: Short Reach vs Long Reach

One of the most important factors when selecting a replacement fuel cap for Early Bronco is the reach.

• 66-70 Ford Bronco models used a short reach gas cap

• 71-76 Ford Bronco models used a long reach fuel cap

This refers to the distance between the sealing gasket and the retaining tabs:

• Short reach caps: tabs sit about 1/4 inch from the gasket

• Long reach caps: tabs sit about 1/2 inch from the gasket

Using the wrong Early Bronco gas cap can lead to poor sealing, fuel vapor leaks, or improper fitment at the filler neck.

1977 Ford Bronco Fuel Cap Design

The 1977 Ford Bronco introduced a fuel door that concealed the gas cap inside the quarter panel, changing both the design and function.

This updated fuel cap included:

• Front-facing grip tabs for easier removal inside the fuel door housing

• An unpainted finish since it was no longer visible externally

This 1977 Bronco gas cap is unique and not interchangeable with earlier 66-76 exposed cap setups.

Whether you're restoring a stock look or upgrading to a reliable replacement gas cap for your Early Bronco, understanding the correct style and reach will ensure proper sealing, fitment, and long-term performance for your fuel system.