Stant 12404 Fuel Cap Tester Adapter

Fuel Cap Tester Adapter for Stant Systems

Stant Part Number 12404 is a fuel cap tester adapter made for use with Stant fuel cap testers. It uses a color-coded design for quick identification and a durable plastic construction for shop use. This adapter supports fuel cap and evaporative system testing on a wide range of Chrysler, Dodge, Plymouth, Chevrolet, GMC, Buick, Oldsmobile, Pontiac, Cadillac, and Mercury applications.

Key Features

• Brand: Stant
• Part Number: 12404
• Fuel cap tester adapter for Stant fuel cap testers
• Color-coded for fast adapter identification
• Durable plastic construction
• Fits a broad range of classic vehicle applications from 1970-1981

Product Details

The Stant 12404 Fuel Cap/System Tester Adapter is a service tool component used with Stant fuel cap testers to evaluate fuel cap and evaporative emission system sealing on listed vehicles. The brand line identifies it as a dedicated fuel cap/system tester adapter, and the yellow color coding helps technicians select the correct adapter during testing. Part Number 12404 is listed across many older domestic platforms, including Chrysler New Yorker, Dodge D150, Chevrolet C10, GMC Jimmy, and Pontiac Firebird applications.

Compatible vehicle coverage includes Fits 1971-1974 Pontiac Firebird, N/A; Fits 1975-1980 Chevrolet C10, N/A; Fits 1978-1980 Dodge D150, N/A; and Fits 1972-1978 GMC Jimmy, N/A. This part cross-references no additional part numbers in the provided data.

What It Is Used For

• Fuel cap leak testing on supported vehicles
• Evaporative emission system diagnosis
• Identifying the correct adapter during shop testing
• Service work on classic Chrysler, Dodge, Chevrolet, GMC, Buick, Oldsmobile, Pontiac, Cadillac, and Mercury models
• Testing fuel cap sealing on vehicles with and without threaded filler neck notes listed in fitment

Installation Notes and Tips

Use this adapter only with Stant fuel cap testers. Match the adapter to the vehicle application and note any fitment comments such as “W/O Threaded Filler Neck,” “W/Evaporative Emission System,” or “Late” before testing. Confirm the fuel cap tester setup is clean and the adapter is seated correctly before beginning diagnosis.

Quality Assurance

Stant supplies this adapter as a durable plastic service tool component for fuel cap testing. The color-coded design supports fast identification in a professional diagnostic setting.