IEQFUE Fuel Tank Cap 3.5" Inside Diameter Replacement for Husqvarna Cub Cadet - Vented, Gasket-Sealed

IEQFUE Fuel Tank Cap 3.5" inside diameter (part 779306) is a direct-fit replacement fuel cap engineered to seal mower fuel tanks on multiple Husqvarna, Cub Cadet, Toro and other commercial and residential riding mowers.

This replacement fuel cap restores a secure, vented seal for models that use a 3.5-inch inside diameter filler opening. Manufactured to match the general form and function of original equipment, the cap helps prevent spills, reduce evaporation and keep debris out of the tank. It ships with a one-year warranty and is identified by part number 779306, making it a straightforward swap for many models from Husqvarna, Cub Cadet, Ariens, Toro, Troy-Bilt, Ferris and John Deere where the OEM part numbers align.

Which mower models will this fuel cap fit?

The IEQFUE fuel cap is compatible with a broad range of walk-behind and zero-turn mowers that accept a 3.5" inside diameter cap. Fitment covers several OEM part numbers, so check the tank opening size and your machine's parts list before ordering. It is intended as a replacement for listed part numbers on common residential and light commercial equipment.

• Husqvarna: 539106188, 539130394 and related variants
• Cub Cadet/MTD: 751-3124B/D, 951-3124B/D/E
• Toro/Troy-Bilt/Ariens/Ferris/John Deere: cross-references like 109-0340, RE216842, 41410012, 1521866

How easy is it to replace my old fuel cap with this one?

Replacement is tool-free in most cases: remove the original cap by turning and lifting, then seat the IEQFUE cap and twist to lock. The design mirrors OEM caps so alignment and venting features work the same way. Always ensure the cap threads and gasket are clean and undamaged before installation.

• Tool-free twist-on installation for common filler necks
• Gasket seating designed to reduce leakage and fumes
• Compatible with standard 3.5" inside diameter openings

What materials and features should I expect?

The cap is made to be durable in outdoor equipment environments and includes a gasket and venting to balance tank pressure. It’s not a complex assembly—its reliability depends on fit and a clean sealing surface. The one-year warranty provides basic coverage against defects in materials and workmanship.

• Durable polymer construction suitable for fuel exposure
• Integrated gasket for a tight seal and reduced evaporation
• Vented design to prevent pressure build-up in the tank

Will this cap prevent fuel spills and evaporation?

When installed correctly on a compatible filler neck, the cap helps minimize fuel loss from splashing, evaporation and contamination. It is designed to seat tightly and permit controlled venting rather than leaving the tank open. For best performance, replace any cracked gaskets or damaged filler necks before installing the new cap.

• Tight gasket seating reduces leaks and evaporation
• Venting avoids pressure-related spray during operation
• Keep mating surfaces clean for optimal sealing

Who is this for: This IEQFUE 3.5" fuel tank cap is for homeowners, landscapers and service technicians who need a reliable, compatible replacement for worn or missing mower caps. Choose it when your machine lists one of the cross-referenced numbers or when your filler opening measures a 3.5" inside diameter. If you require OEM branding or a model-specific serialized part, verify fitment against your machine’s parts manual before purchase.