DIESEL CAP 3 PIN LOCK

Description

🔐 Diesel Fuel Cap with 3‑Pin Lock – Description

Overview

A 3‑pin (or three‑prong) locking diesel fuel cap is a security cap designed to slide into place using three metal prongs and then lock with a slight quarter‑turn. This mechanism enables faster installation and provides theft resistance.

• Fast-lock design: The three tabs (prongs) align with corresponding slots on the filler neck. Once inserted, a quarter‑turn twist engages the lock securely

• Often referred to as “quick‑turn,” “triangle prong,” or “3‑pin” locking style caps used in Ford, Freightliner, and various commercial diesels.

Features

• Material: Typically made from aluminum alloy or heavy-duty steel, offering strong resistance to wear and corrosion

• Locking mechanism: Includes a keyed lock cylinder—usually supplied with two matching keys.

• Vented vs. Non‑vented: Some systems require vented caps (common), while others need non‑vented versions depending on tank venting configuration .

• Includes: Rubber seal/gasket, safety tether or chain to prevent misplacement, bail or tether posts for secure attachment.

Typical Dimensions & Compatibility

• Often sized around 3-inch outer diameter (e.g. fits 3‑inch filler necks with 8 UNNS or similar thread spec). Common for Freightliner Cascadia, Columbia, FLD, and Century trucks

• Many caps replace OEM parts such as Freightliner 03‑37017‑002 / 0337017002.

• Compatibility varies by chassis: Freightliner, Ford 3‑prong caps, Volvo/Mack/International using 3.0‑8 UNNS low‑sulfur variants.

Use Cases

• Prevents fuel theft and tampering, especially during long-haul stops or in insecure parking.

• Ensures a secure seal to avoid fuel evaporation or leakage.

• Often drop-tested and compliant with DOT safety standards (FMCSA‑39367) .

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