Locking Fuel Cap Quick Guide
Park your truck anywhere without worrying about fuel theft! Fuel prices are steadily on the rise and we know how important it is to save your hard-earned money. Locking fuel caps are an excellent way to prevent fuel theft, we have a wide selection of locking fuel caps for a wide selection of trucks. If you are unsure of which fuel-cap you need, take a look at our quick guide below of how to properly measure your fuel cap to ensure its fit:
- All Cap designs/styles have been "Drop Tested" to meet DOT qualifications for HWY Transportation Fuel Tank safety. FMCSA-39367
- Always measure the inside diameter (ID) of Fuel Cap for a more positive Identification if there is any question as to which Cap to use.
- Should the Cap not be available - measure the outside diameter (OD) of the Fill Tank Neck to determine inside Diameter (ID) of Cap.
- 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.
Below you can find a list of fuel caps and their internal diameters. Each fuel cap has a link to our fuel caps with the internal diameters listed below. To ensure that your fuel cap fits please measure the internal diameter of your fuel cap and refer to the list below for the best fitting fuel cap for your truck.
Check out the following Locking Fuel Cap Quick Guide to find the caps you need for your truck. For more information contact us at EZ Truck Store or check out FTA's full line of products at https://www.fueltankaccessories.com/
***Images for how to measure the internal diameter of your fuel tank can be found below. ***
| Fuel Tank Cap Brand Recommendation | Fuel Tank Cap Internal Diameter | Link to Fuel Tank Cap |
| Borg Warner | Internal Diameter of 2.25inches | Link: |
| Fuel Caps for Borg Warner Steel Tanks - EZ Truck Store | ||
| Freightliner Trucks | Internal Diameter of 2.38inches | Link: |
| Freightliner Fuel Caps - EZ Truck Store | ||
| Volvo Trucks | Internal Diameter of 2.88inches | Link: |
| Volvo Fuel Caps - EZ Truck Store | ||
| MAC Trucks | Internal Diameter of 3.37inches | Link: |
| Mack Fuel Caps - EZ Truck Store | ||
| Kenworth Fuel Caps | Internal Diameter of 3.38inches | Link: |
| Kenworth Fuel Caps - EZ Truck Store | ||
| International Trucks | Internal Diameter of 3.37inches | Link: |
| International Fuel Caps - EZ Truck Store | ||
| Reefer Fuel Tanks | Internal Diameter of 2.25inches | Link: |
| Reefer Tank Fuel Caps - EZ Truck Store | ||
| International Medium Duty Trucks | Internal Diameter of 2.25inches | Link: |
| International MD Fuel Caps - EZ Truck Store | ||
| Ford F650/F750 Trucks | Internal Diameter of 2.25inches | Link: |
| Ford F650/F750 Fuel Caps - EZ Truck Store | ||
| Isuzu Trucks | Internal Diameter of 2.25inches | Link: |
| Isuzu Truck Fuel Caps - EZ Truck Store | ||
| Locking Fuel Caps for Peterbilt Trucks | Internal Diameter not defined | Link: |
| Fuel Caps for Peterbilt Trucks - EZ Truck Store | ||
| Locking Fuel Caps for Threaded Fuel Tanks | Internal Diameter of 4.35inches | Link: |
| Universal 4 In Fuel Caps - EZ Truck Storecaps/fuel-caps-for-4-inch-threaded-fuel-tanks.html |