Fuel Tank Cap 17620-ZL8-023 951-10300 Compatible with Honda GC135 GC160 GC190 GCV135 GCV160 GCV190 GX100 GXV160 Lawn Mower Engines Gas Cap 17620-ZL8-003 17620-ZL8-013 MTD 751-10300

What It Is

This is a replacement fuel tank cap for Honda small engines and compatible MTD models. It seals the gas tank to prevent fuel spillage and evaporation, commonly used on walk-behind mowers, pressure washers, and generators powered by GC, GCV, GX, or GXV series engines.

Fitment & Compatibility

Check your engine model number (stamped on the valve cover or blower housing), not the mower deck size. This cap fits Honda GC135, GC160, GC190, GCV135, GCV160, GCV190, GX100, and GXV160 engines. Also fits MTD models using the 751-10300 cap. OEM part numbers: 17620-ZL8-023, 17620-ZL8-003, 17620-ZL8-013. The cap diameter is approximately 1.5 inches (38mm) with a standard threaded neck. If your existing cap measures the same, it will fit. Aftermarket versions (like this one) are usually identical in form and function to OEM, but check that the vent hole is present and unobstructed.

Key Things to Know

• Quality: This cap is a direct-fit aftermarket replacement. It seals well and includes the necessary venting to prevent vacuum lock in the tank. Some users report it feels slightly less robust than OEM, but it holds up fine for normal use.
• Installation: No tools required. Simply unscrew the old cap and screw on the new one until snug. Do not overtighten—hand-tight is sufficient.
• Common gotchas: If your engine is hard to start or runs lean after replacement, the cap vent may be blocked. Check the tiny hole in the cap’s underside. Also, if your original cap had a tether, this cap may not include one—verify before buying if that matters.
• Price: At $7.99, it’s significantly cheaper than OEM Honda caps (often $12–$20) and performs identically for most users.

Should You Buy It

Yes, if you need a reliable, affordable replacement for a lost, cracked, or leaking fuel cap on one of the listed Honda or MTD engines. It’s a simple fix that avoids fuel spills and keeps dirt out of the tank. Skip it only if you require an exact OEM cap with a tether or prefer paying extra for the Honda brand label.