Gates Fuel Tank Cap P/N:31625

Seal the filler neck and keep your classic's fuel system breathing correctly with the Gates Fuel Tank Cap 31625. This OE-equivalent cap is a direct-fit replacement across a wide span of vintage applications, including the 1936-1942 Lincoln Zephyr, the 1941-1942 and 1945-1947 Ford 1 Ton Pickup, the 1948-1950 Ford F-1, the 1951-1953 Hudson Hornet, the 1966-1969 Jeep CJ Series, and the 1959-1969 Jeep CJ5 — see the Buyer's Guide tab for the full list of 73 applications.

• Two-way relief valve: a pressure-relief/vacuum-relief action lets the fuel tank "breathe" while helping keep fuel fumes from escaping.
• Fuel-resistant seal: the sealing gasket is compounded from fuel-resistant rubber to close off the filler neck.
• Rugged construction: built to OE-level standards and designed to fit both shallow and deep cam filler necks — vented, non-vented, and vented anti-surge.
• OE-equivalent replacement: Gates lists the 31625 as an OE-equivalent fuel tank cap that installs in place of the original on the listed applications.

The fuel tank cap seats on the filler neck to close off the tank while its two-way valve regulates pressure and vacuum as fuel is drawn down and temperatures change. If the original cap's seal has hardened, cracked, or lost its grip, fuel vapors can escape and the tank may not hold proper pressure — signs this cap may need replacing. Diagnose the cause first; if a failed cap is the issue, this Gates unit installs in place of the worn original on the listed applications.