Genuine Exmark 137-4119 Ratcheting Fuel Cap Quest Pioneer Turf Tracer E S X OEM

What It Is

The Genuine Exmark 137-4119 is a ratcheting fuel cap designed to replace the original cap on Exmark Quest, Pioneer, Turf Tracer, E, S, and X series mowers. It provides a secure, vented seal for the fuel tank and allows easy one-hand operation without cross-threading.

Fitment & Compatibility

Check your model series: This cap fits Exmark Quest (all variants), Pioneer, Turf Tracer, and E, S, X series zero-turn mowers. It does not fit older Lazer Z or LCT engine models without verifying tank neck size.

Measure the fuel neck: The cap fits a standard 2-inch outer diameter fuel neck. If your mower uses a smaller or larger neck (common on some Kawasaki or Kohler engines), this cap will not seal properly.

OEM vs aftermarket: This is a genuine Exmark part, not a universal or aftermarket cap. It matches the original fit and venting specs exactly. Avoid generic caps that may not vent correctly or cause pressure issues.

Deck size irrelevant: Deck size does not affect compatibility—only the fuel tank neck diameter matters.

Key Things to Know

• Installation is tool-free: Simply remove the old cap and twist the new one on until it ratchets. No wrenches or sealants needed.
• Ratcheting prevents overtightening: The cap clicks when snug, so you won’t crack the tank or strip threads. This is a common failure point with non-ratcheting caps.
• Vent is built-in: The cap includes a one-way vent that releases pressure but prevents fuel slosh. If the vent clogs, the engine may starve for fuel—clean it occasionally with compressed air.
• Check for missing tether: Some older Exmark models had a tether; this cap does not include one. If you need a tether, buy a separate kit (Exmark 116-5905).

Should You Buy It

If you own a compatible Exmark Quest, Pioneer, Turf Tracer, E, S, or X series mower and need a direct OEM replacement that won’t leak or cross-thread, this cap is a solid choice. It’s especially worth it if your current cap is hard to turn, cracked, or doesn’t seal. Skip it if you have an older Lazer Z or a non-Exmark mower—measure first.