GM Genuine Parts GT358 (23361898) Fuel Tank Filler Cap – GM OE Replacement

Overview

The GM Genuine Parts GT358 Fuel Tank Filler Cap is a threaded cap crafted to seal your vehicle’s fuel filler neck. As a GM Original Equipment replacement, it mirrors the fit, performance, and service life you expect from General Motors. The cap includes a rubber gasket that creates a liquid-tight seal to keep fuel in and water or dirt out. Some versions may feature a check-valve to vent air as needed based on tank pressure.

Why this matters

A dependable fuel cap helps maintain a clean and efficient fueling system. By ensuring a tight seal, the cap can help prevent vapor release and protect the integrity of the filler neck, contributing to smoother daily fueling experiences and reducing the likelihood of contaminants entering the system.

Key benefits

• Tight seal keeps the fuel tank closed during operation and fueling
• Liquid-tight gasket helps prevent water and dirt intrusion
• Sealed tank support can reduce vapor emissions and environmental impact
• GM-recommended replacement part for your GM vehicle’s original component
• Quality, reliability, and durability associated with GM OE components

Real‑world use

Designed for GM models that require the GT358 cap, this part offers straightforward installation and dependable sealing in everyday fueling scenarios—from quick top-ups on busy mornings to longer drives on the highway. Its sturdy construction is built to perform across typical temperature ranges and driving conditions.

What to expect

• Rubber gasket for a secure, liquid-tight seal
• Durable threading and materials aligned with GM OE standards
• Potential check-valve venting to accommodate tank pressure changes