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Peterbilt Locking Fuel Cap
Peterbilt Locking Fuel Cap Front and Back of Locking Fuel Cap

Peterbilt Locking Fuel Cap 

Made In USA
Price: $73.50 - $96.00

Choose Your Fuel Cap:

!Please Choose Your Fuel Cap

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Fits all Peterbilt Lever Style Fill Necks. Prevent thieves from stealing your fuel! Fuel Tank Must be Vented

Top Features:

  • 4.0" Aluminum Cap Assembly
  • Locking for 4" Schedule 40/80 Neck
  • Pressure Relief (Over Pressure)
  • 8.00" Chain & 6.50" Bail
AvailabilityIn Stock
Returns30 days w/ 15% Restocking Fee
Warranty90 Days
ShippingSee Cart
ManufacturerFuel Tank Accessories
Model No.Several
  • Shipping GuideShipping Guide

For accurate measurement, it is essential to measure the Inside Diameter (ID) of Fuel Cap. If the Fuel Cap is not available, measure the Outside Diameter of the Fuel Neck to determine Inside Diameter of Cap.

When you Order a pair of Locking Fuel Caps, they will be Keyed Alike (use the same key).

The Peterbilt locking fuel cap is a 4.0" cap assembly that is constructed of high grade aluminum. The fuel cap has no lettering on the top.

Always make sure and if the Tank is either Vented or non-Vented in order to spec correct Vented or Non-Vented Cap. (note: a Vented Cap is made to work with a non-Vented Tank; it is also safe to use on a Diesel Fuel Tank that is already Vented) a non-Vented Tank Must have a Vented Cap to operate properly.

The inside diameter (ID) of Caps used with Low-Sulfur labeled Diesel Fuel Tanks are smaller and have different treads than Caps used with Diesel Fuel Tanks that have no Low Sulfur Label. (See the Volvo Description on the above PDF File as an example)

All Caps are Threaded Female style. (except the Peterbilt Lever Style and Freightliner Cam-Cap Style) Some Older Fuel Tank fill necks (pre 2000) may have a different size and thread than current Tanks.

Though Steel Tanks are not as common in the HD Truck Industry as Aluminum, it is recommended to clarify whether the tank is Aluminum or Steel.

NPSM (National Pipe Straight Medium) Threaded Caps will not fit NPSL (National Pipe Straight Loose) or NPT Fill Neck Threads. However, NPSL will fit NPSM threaded Fill Necks.

Other Features:

  • Locking for 4" Schedule 40/80 Neck
  • 8.00" Chain & 6.50" bail (End of chain connection) w/o "DIESEL FUEL ONLY" No Lettering on Cap
  • Numbers on the underside of the cap: None

Example Fuel Cap Measurement

Example Proper Fill Neck Measurement