1104859200 4 Inch Locking Diesel Fuel Cap for Peterbilt 330 587 Trucks 1972 2017

Product Overview

This 4" Locking Diesel Fuel Cap provides secure closure for saddle tanks on Peterbilt heavy-duty trucks, preventing fuel theft and contamination. The locking cap replaces lost or damaged caps and maintains tank pressurization to support proper fuel delivery. Built for owner-operators and fleet managers, this 4" Locking Diesel Fuel Cap stops unauthorized access and moisture ingress.

Key Features & Performance

• 4-inch threaded diameter fits standard Peterbilt filler necks
• Tumbler-style lock with two keys included for controlled access
• Heavy-duty die-cast metal body with corrosion-resistant black powder-coat finish
• Built-in vent prevents vacuum lock during fuel draw
• Thick O-ring seal blocks water, dirt, and road debris
• Direct replacement for OEM part 11-04859-200

Fitment & Compatibility

• 1972-2017 Peterbilt trucks with 4-inch fuel tank opening
• Peterbilt 330, 335, 337, 340, 345, 348
• Peterbilt 357, 359, 362, 367, 372, 375, 377, 378, 379
• Peterbilt 384, 385, 386, 387, 388, 389, 548, 587

Common Uses

• Replacing broken or missing fuel caps on diesel saddle tanks
• Preventing fuel siphoning and theft at truck stops and overnight yards
• Maintaining tank pressurization to aid fuel pump delivery
• Protecting fuel from water contamination during wet weather
• Restoring proper fuel system operation after a cap is lost

Technical Specifications

• Part Number(s): 11-04859-200
• Cap Diameter: 4 inches (threaded)

Frequently Asked Questions

Q: Will this cap fit my Peterbilt 379 with a 4-inch filler neck? A: Yes, it is designed for all 1972-2017 Peterbilt models with a 4-inch tank opening, including the 379.

Q: Does the locking mechanism prevent fuel from spilling if the truck tips? A: The cap provides a tight seal and includes a vent, but it is not a rollover vent; for full rollover protection, consult your tank manufacturer.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.