Exmark 109-0346 Fuel Gas Cap Lazer Z Quest Turf Tracer AC AS CT ECS HP LC Metro

What It Is

The Exmark 109-0346 fuel gas cap is an OEM replacement cap designed to seal the fuel tank on select Exmark zero-turn mowers. It’s a direct fit for fuel systems on Lazer Z, Quest, Turf Tracer, and other Exmark commercial/consumer models, preventing leaks and vapor loss during operation or transport.

Fitment & Compatibility

Before buying, confirm your mower model and serial number against Exmark’s parts list. This cap fits:

• Lazer Z (including LZ, LZS, LZAC, LZCT, LZHP, LZLC, LZEC, LZAS, LZSC, LZPC)
• Quest (QS, QST)
• Turf Tracer (TT, TTS)
• Metro (ME, MEC)
• AC, AS, CT, ECS, HP, LC series

It does not fit older or non-Exmark mowers—check the cap’s thread size (approx. 2.25” diameter, standard 4-turn thread) and compare to your existing cap. For aftermarket alternatives, verify thread pitch and venting style (this cap is non-vented—relies on tank vent elsewhere). Always measure your current cap’s outer diameter and thread count to avoid mismatch.

Key Things to Know

• OEM quality: This is an Exmark genuine part, not a generic replacement. Expect consistent fit, seal, and materials (UV-resistant plastic).
• Installation: No tools needed—just twist off old cap and hand-tighten new one until snug. Do not overtighten; hand-tight only to avoid cracking the cap or tank neck.
• Venting note: This cap is non-vented. If your mower’s fuel tank has a separate vent line (common on Lazer Z), this cap will work. If your tank requires a vented cap, you’ll need a different part (e.g., Exmark 1-633047).
• Common gotcha: The cap may feel loose if the tank neck is damaged or worn—inspect for cracks or deformation before buying. Also, verify you’re ordering the correct cap for your model year (serial number range matters).

Should You Buy It

Buy this cap if you own a compatible Exmark zero-turn mower and need a direct, no-guesswork replacement that seals tightly and lasts. It’s ideal for owners who prefer OEM parts for reliability and don’t want to risk aftermarket fit issues. Skip it if you have a non-Exmark mower or a model requiring a vented cap—measure first and confirm.