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Chrome Rush countdown – 14% off semi truck parts and chrome accessories at 4 State Trucks
Chrome Rush countdown – 14% off semi truck parts and chrome accessories at 4 State Trucks

Freightliner SD 108-122 Fuel Tank Caps

When looking for tank caps for your Freightliner SD 108-122 truck, explore a variety of options at 4 State Trucks. Choose from materials like stainless steel, plastic, and chrome. With diesel gas cap choices ranging from front fill to side fill and reverse twist caps, find the perfect match today!
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  • CSM Black Aluminum Alloy Water Tank Cap

    CSM Black Aluminum Alloy Water Tank Cap

    CHROME SHOP MAFIA

    $16.47
    38MM Water Tank Cap By Chrome Shop MafiaSafeguard your truck's fluids with the Chrome Shop Mafia Black Aluminum Alloy Water Tank Cap. Constructed from heavy-duty aluminum alloy weld billet, it fits...
    09-0707002
    SKU:
    09-0707002
    Ready To Ship:
    Yes
    Color:
    Black
    Make:
    Universal Items
    Product Type:
    Fuel Tanks
    Material Options:
    Aluminum
    $16.47
    Qty in Cart: 0
    Price:
    $16.47
    Subtotal:
  • Chrome Plastic Fuel Cap Locking Cover For Freightliner

    Chrome Plastic Fuel Cap Locking Cover For Freightliner

    UNITED PACIFIC

    $9.22
    Freightliner Chrome Locking Fuel Cap Cover ReplacementThis chrome fuel cap cover locks securely and fits various Freightliner models and years. Made from durable injection-molded plastic, it features...
    03-06010017
    SKU:
    03-06010017
    Finish Options:
    Chrome-Plated
    Product Type:
    Fuel Tanks
    Material Options:
    Plastic/Poly
    Make:
    Freightliner
    $9.22
    Qty in Cart: 0
    Price:
    $9.22
    Subtotal:
  • 4 Inch Aluminum Locking Fuel Cap

    4 Inch Aluminum Locking Fuel Cap

    AFTERMARKET

    $366.99
    4 Inch Fuel Cap Locking-8 NPSF Thread* High Quality Locking Fuel Cap* Aluminum* 4 Inch- 8 NPSF Thread* Vented * Made In USA* Sold Individually* Warranty On Locking Fuel Caps Against Defects In...
    09-06010001
    SKU:
    09-06010001
    Material Options:
    Aluminum
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $366.99
    Qty in Cart: 0
    Price:
    $366.99
    Subtotal:
  • Aluminum Leak Defender Fuel Cap and Anti-Siphon Kit For Freightliner

    Aluminum Leak Defender Fuel Cap and Anti-Siphon Kit For Freightliner

    HEAVY TRUCK SOLUTIONS

    $375.99
    Freightliner 3-Piece Fuel Neck Adapter Set W/ Collar, Fuel Cap, and Anti-Siphon DeviceTired of leaking fuel caps on your Freightliner truck? The Leak Defender with an anti-siphon device offers a...
    03-06010013
    SKU:
    03-06010013
    Truck Class:
    Heavy Duty
    Product Type:
    Fuel Tanks
    Make:
    Freightliner
    Material Options:
    Aluminum
    $375.99
    Qty in Cart: 0
    Price:
    $375.99
    Subtotal:
  • Aluminum Leak Defender Fuel Tank Adapter System Kit For Freightliner

    Aluminum Leak Defender Fuel Tank Adapter System Kit For Freightliner

    HEAVY TRUCK SOLUTIONS

    $300.99
    Freightliner 2-PC Fuel Tank Adapter System With Collar & Fuel CapStop fuel cap leaks with the Freightliner Leak Defender Fuel Cap and Collar Kit. This 2-piece design offers a simple solution for...
    03-06010012
    SKU:
    03-06010012
    Product Type:
    Fuel Tanks
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Ready To Ship:
    Yes
    Material Options:
    Aluminum
    $300.99
    Qty in Cart: 0
    Price:
    $300.99
    Subtotal:
  • Leak Defender Fuel Cap

    Leak Defender Fuel Cap

    HEAVY TRUCK SOLUTIONS

    $156.99
    Leak Defender Replacement Fuel CapStop fuel cap leaks with the Leak Defender Replacement Fuel Cap. Designed for trucks from Peterbilt, Kenworth, and more, it helps ensure a tight seal every time,...
    09-06010014
    SKU:
    09-06010014
    Product Type:
    Fuel Tanks
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    $156.99
    Qty in Cart: 0
    Price:
    $156.99
    Subtotal:
  • 3.5 OD X 2.85 Inch ID Fuel Cap Gasket

    3.5 OD X 2.85 Inch ID Fuel Cap Gasket

    AUTOMANN USA

    $3.80
    Replacement 0.14 Inch Thick Fuel Tank Cap GasketNeed a replacement gasket for your 572.1017 fuel cap? This rubber gasket measures 2.85 inches I.D., 3.50 inches O.D., and has a thickness of 0.14...
    09-06010002
    SKU:
    09-06010002
    Truck Class:
    Heavy Duty
    Diameter Options:
    2 3/4 Inch
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Fuel Tanks
    Ready To Ship:
    Yes
    $3.80
    Qty in Cart: 0
    Price:
    $3.80
    Subtotal:
  • Chrome Plastic Non- Locking Fuel Cap Cover For Freightliner

    Chrome Plastic Non- Locking Fuel Cap Cover For Freightliner

    UNITED PACIFIC

    $11.54
    Chrome Fuel Cap CoverThis Freightliner Non-Locking Fuel Cap Cover is simple to install with its pre-applied double-sided tape. It's constructed with quality injection-molded plastic for lasting...
    03-06010006
    SKU:
    03-06010006
    Finish Options:
    Chrome-Plated
    Material Options:
    Plastic/Poly
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Fuel Tanks
    Ready To Ship:
    Yes
    $11.54
    Qty in Cart: 0
    Price:
    $11.54
    Subtotal:
  • 3 Inch Aluminum Female Vented Locking Cap For Freightliner

    3 Inch Aluminum Female Vented Locking Cap For Freightliner

    VELVAC

    $116.99
    3 Inch Locking Fuel CapThe Aluminum Locking Fuel Cap uses a patented Loc-Gard system to keep out moisture and contaminants. It comes with a safety chain and crossbar and includes two keys.* High...
    03-060318
    SKU:
    03-060318
    Diameter Options:
    3 Inch
    Material Options:
    Aluminum
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Fuel Tanks
    Location:
    Made In USA
    Style Options:
    Female
    $116.99
    Qty in Cart: 0
    Price:
    $116.99
    Subtotal:
  • FREE SHIPPING OVER $249
    2 Inch 11.5 TPI Brass Non-Vented Locking Fuel Cap

    2 Inch 11.5 TPI Brass Non-Vented Locking Fuel Cap

    VELVAC

    $79.99
    2 inch Locking Fuel Cap, Non- VentedKeep your fuel tank secure with this 2-inch non-vented brass fuel cap. Locks tight to prevent leaks and tampering. Ideal for various vehicles and equipment. Rest...
    29-060315
    SKU:
    29-060315
    Diameter Options:
    2 Inch
    Truck Class:
    Heavy Duty
    Style Options:
    Non Vented
    Material Options:
    Brass
    Make:
    Universal Items
    Product Type:
    Fuel Tanks
    Ready To Ship:
    Yes
    $79.99
    Qty in Cart: 0
    Price:
    $79.99
    Subtotal:
  • FREE SHIPPING OVER $249
    2 Inch Brass 11.5 TPI Non-Vented Fuel Cap

    2 Inch Brass 11.5 TPI Non-Vented Fuel Cap

    VELVAC

    $45.16
    2 Inch Non-Vented Fuel CapLooking for a reliable fuel cap for your industrial or automotive needs? Check out the Brass 2 Inch 11.5 TPI Non-Vented Fuel Cap. Made of durable brass, it's perfect for...
    09-060301
    SKU:
    09-060301
    Truck Class:
    Universal
    Diameter Options:
    2 Inch
    Material Options:
    Brass
    Make:
    Universal Items
    Product Type:
    Fuel Tanks
    Style Options:
    Non Locking
    Ready To Ship:
    Yes
    $45.16
    Qty in Cart: 0
    Price:
    $45.16
    Subtotal:
  • 2 Inch Aluminum Non-Locking, Female, Vented Fuel Cap With 11-1/2 Threads

    2 Inch Aluminum Non-Locking, Female, Vented Fuel Cap With 11-1/2 Threads

    VELVAC

    $89.99
    2 Inch Non-Locking Fuel Cap, VentedReplace a poorly fitting fuel cap with this premium quality non-locking Velvac Fuel cap that is precision designed to deliver OE fit and functionality. It will...
    09-060300002
    SKU:
    09-060300002
    Truck Class:
    Universal
    Diameter Options:
    2 Inch
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Fuel Tanks
    $89.99
    Qty in Cart: 0
    Price:
    $89.99
    Subtotal:
  • FREE SHIPPING OVER $249
    CSM Non-Vented Lever Lock Flush Fuel Tank Cap Assembly

    CSM Non-Vented Lever Lock Flush Fuel Tank Cap Assembly

    CHROME SHOP MAFIA

    $190.99
    Non-Vented Lever Lock Flush Fuel Cap Assembly by Chrome Shop MafiaThis flush fuel cap assembly features an unvented cap with a lever lock and an O-Ring Seal. It is sold individually and is made in...
    09-060300
    SKU:
    09-060300
    Truck Class:
    Universal
    Location:
    Made In USA
    Style Options:
    Non Vented
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Fuel Tanks
    Ready To Ship:
    Yes
    $190.99
    Qty in Cart: 0
    Price:
    $190.99
    Subtotal:
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Introducing the Freightliner SD 108-122 Fuel Tank Caps product lineup - your one-stop-shop for all your semi-truck fuel tank cap needs. Whether you're looking to replace a worn-out cap, upgrade to a more secure locking option, or add an anti-siphon tube, this product lineup has a diverse selection to choose from. Key features of the Freightliner SD 108-122 Fuel Tank Caps include heavy-duty construction, advanced locking mechanisms, and innovative designs to prevent fuel leaks and theft. Many models also offer vented options for improved airflow and functionality. Customers can find non-vented, locking, and locking vented caps to suit their specific truck requirements. The benefits of investing in a quality fuel tank cap are numerous. A proper fitting, secure cap helps maintain fuel system integrity, maximizes fuel efficiency, and deters would-be thieves. By upgrading to a Leak Defender or CSM model, you can enjoy added peace of mind on the road. Whether you operate a fleet or own a single semi-truck, the Freightliner SD 108-122 Fuel Tank Caps product lineup has the high-performance, durable solutions you need to keep your truck running strong. Browse the selection today and find the perfect replacement or upgrade to keep your fuel secure and your truck moving forward.

Frequently Asked Questions About Freightliner SD 108-122 Fuel Tank Caps

Will this fuel tank cap fit my Freightliner SD 108 or 122 model?

Fuel tank caps for the Freightliner SD 108-122 series are designed to fit the fuel tank neck and thread pattern used on these specific truck models. Because fuel systems can vary by tank size, build year, and configuration, we recommend checking your existing cap's thread diameter and locking mechanism, or referencing your truck's VIN and tank specs, before ordering to confirm a proper fit.

What is the difference between locking and non-locking fuel tank caps?

Locking fuel tank caps include a key-operated mechanism that helps deter fuel theft and unauthorized access, which is especially useful for fleet vehicles or trucks parked in high-traffic areas. Non-locking caps are simpler and typically used when added security isn't a priority. Both styles are available in this category, so be sure to select the version that matches your current cap's function.

What materials and finishes are available for these fuel tank caps?

Freightliner SD 108-122 fuel tank caps are commonly available in chrome-plated and plastic or composite options, depending on the manufacturer. Chrome caps offer a polished, durable look that matches other chrome trim on the truck, while plastic caps tend to be a lighter, more budget-friendly alternative. Choose based on your truck's existing appearance and your durability preferences.

How do I install a replacement fuel tank cap?

Most replacement fuel tank caps thread directly onto the existing fuel tank neck, similar to the factory-installed cap. Simply remove the old cap by turning it counterclockwise, then thread the new cap on clockwise until it is snug and sealed. If your cap includes a locking feature, make sure to test the key function before you're back on the road.

Can a damaged or missing fuel tank cap cause problems with my truck?

Yes. A cracked, loose, or missing fuel tank cap can allow dirt, moisture, or debris into the fuel system and may also lead to fuel evaporation or minor leaks. Replacing a worn or damaged cap promptly helps protect your fuel system and keeps your truck running as intended.

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