FILLER NECK KITS

The Filler Neck Solution for Truck Upfits

A proven fix for fuel flow issues caused by body modifications

Custom upfits like box deletes, utility bodies, and cab-chassis conversions often require a fabricated filler neck. While that may work initially, fuel flow problems—slow filling, pump shut-off, or splashback—often show up later at the pump.

Transfer Flow retrofit fuel filler neck kits are engineered to restore proper fuel flow after vehicle modifications. Designed for gasoline and diesel applications, they provide correct venting, angles, and internal geometry for smooth, consistent, OEM-style fueling.

Trusted by professional upfitters nationwide, our application-specific kits fit Ram, Dodge, Ford, GMC, and Chevy pickups and cab chassis. Gasoline kits include a CARB Executive Order and are 50-state emissions compliant.

Built to eliminate common post-upfit fueling problems

Slow or inconsistent fill rates
Premature pump shut-off
Fuel splashback or burping

Each kit is engineered for the vehicle it fits, ships complete with all required components, and installs cleanly without trial-and-error. Transfer Flow filler neck kits deliver reliable fueling performance in demanding work-truck and fleet applications.

Why Upfitters Choose Transfer Flow Filler Neck Kits

Precision Engineered – Designed for specific vehicle makes and models to ensure a perfect fit and seamless installation.
OEM-Quality Reliability – Built to meet or exceed original equipment standards for professional-grade performance.
Versatile Applications – Compatible with Ford, Chevy/GMC, and Dodge/Ram pickups and cab chassis for maximum flexibility.
Durable Construction – Manufactured using premium materials with protective coatings for long-lasting performance in demanding environments.
Complete Kits – Ships with all required components and detailed instructions for easy, hassle-free installation.
50-State Compliance – Gasoline kits include a CARB Executive Order, making them legal for use in all 50 states.