Massey Ferguson 751-3124E Spare Part - Cap:fuel:3,5" Gas W/o Logo

Original MTD fuel tank cap — part 751-3124E — a direct replacement fuel cap designed for lawn tractors and garden tractors. It’s the original MTD 3.5" cap (≈89 mm diameter) that seals the fuel neck, features a twist-lock fit and an integrated vent to equalize pressure in the tank for smoother fuel flow.

This cap is part of the MTD spare parts lineup and replaces earlier numbers in the 751‑3124 series (and is shown as superseded in the 951‑3124E sequence), so it matches the same neck and thread form used across many MTD/Cub Cadet/Troy‑Bilt machines.

Example models that commonly use this cap include several Cub Cadet residential tractors (models such as 1027, 1440, 1515, 1517, 1525 and similar serial ranges) and MTD/Troy‑Bilt zero‑turns like RZT‑42 and RZT‑50 — please check your model/serial to confirm fit.

Simple to install and made to restore a proper seal quickly, this original MTD cap is a reliable small repair part for owners who need genuine, correctly sized mower hardware rather than generic power tool parts.