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Mack CX Truck Fuel Tank Caps

Looking for Mack CX Truck Fuel Tank Caps? At 4 State Trucks, we've got you covered with various options to keep your fuel secure and your truck looking sharp. Whether you prefer a locking cap or a non-locking, practical solution, we have the right fit for your needs on the road.
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  • Leak Defender 3 1/2 Inch Filler Neck For Mack

    Leak Defender 3 1/2 Inch Filler Neck For Mack

    HEAVY TRUCK SOLUTIONS

    $289.99
    3 1/2 Inch Filler Neck By Leak Defender* High Quality Fuel Neck And Fuel Cap* Made Of Aircraft Billet Aluminum* Leak Defender* 2 Piece Design* Includes:  - Cap  - Collar  - Chain* 8 TPI Thread*...
    11-060100002
    SKU:
    11-060100002
    Product Type:
    Fuel Tanks
    Height Options:
    2 3/4 Inch
    Diameter Options:
    3 1/2 Inch
    Make:
    Mack
    Material Options:
    Aluminum
    $289.99
    Qty in Cart: 0
    Price:
    $289.99
    Subtotal:
  • 3 Inch Non- Vented Locking Fuel Cap For Mack & Volvo

    3 Inch Non- Vented Locking Fuel Cap For Mack & Volvo

    AUTOMANN USA

    $69.99
    3 Inch Non- Vented Locking Fuel Cap Replaces FTAC76Secure your truck's fuel system with this high-quality 3 Inch Non-Vented Locking Fuel Cap, designed for Mack and Volvo vehicles. Featuring a 3.0...
    29-0603038
    SKU:
    29-0603038
    Product Type:
    Fuel Tanks
    Make:
    Volvo
    Make:
    International
    Make:
    Mack
    $69.99
    Qty in Cart: 0
    Price:
    $69.99
    Subtotal:
  • Aluminum Leak Defender Collar & Fuel Cap Kit For Mack

    Aluminum Leak Defender Collar & Fuel Cap Kit For Mack

    HEAVY TRUCK SOLUTIONS

    $289.99
    Mack 2-PC Fuel Tank Adapter System With Collar & Fuel Cap* High Quality Cap And Collar Kit* Includes:  - Collar  - Fuel Cap* Billet Aluminum * Dimensions:  - 2.75 Inch Total Height   - 4.25 Inch Cap...
    11-06010001
    SKU:
    11-06010001
    Truck Class:
    Heavy Duty
    Product Type:
    Fuel Tanks
    Make:
    Mack
    Availability:
    Ready To Ship
    Material Options:
    Aluminum
    $289.99
    Qty in Cart: 0
    Price:
    $289.99
    Subtotal:
  • Leak Defender Fuel Cap O-Ring

    Leak Defender Fuel Cap O-Ring

    HEAVY TRUCK SOLUTIONS

    $10.67
    Leak Defender Fuel Cap Gasket Seal ReplacementDon't forget to replace the original O-ring or gasket of your Leak Defender Fuel Cap every 3-5+ years! This simple maintenance tip helps ensure a tight...
    09-06010016
    SKU:
    09-06010016
    Truck Class:
    Heavy Duty
    Product Type:
    Fuel Tanks
    Availability:
    Ready To Ship
    $10.67
    Qty in Cart: 0
    Price:
    $10.67
    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
    Availability:
    Ready To Ship
    $3.80
    Qty in Cart: 0
    Price:
    $3.80
    Subtotal:
  • Locking Fuel Cap Cover For Kenworth, International, Mack, Volvo W/ 3 Inch Thread On Caps

    Locking Fuel Cap Cover For Kenworth, International, Mack, Volvo W/ 3 Inch Thread On Caps

    AFTERMARKET

    $101.99
    Locking Fuel Cap Covers For 3 Inch CapsThis Locking Fuel Cap Cover is the ultimate solution to protect against fuel theft. It locks securely over your existing fuel cap and spins freely when closed...
    29-060324
    SKU:
    29-060324
    Material Options:
    Aluminum
    Truck Class:
    Heavy Duty
    Make:
    Volvo
    Make:
    Kenworth
    Make:
    Mack
    Make:
    International
    Product Type:
    Fuel Tanks
    $101.99
    Qty in Cart: 0
    Price:
    $101.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Chrome Plastic DEF Cap Cover For Macks & Volvos

    Chrome Plastic DEF Cap Cover For Macks & Volvos

    UNITED PACIFIC

    $12.46
    Chrome DEF Cap Cover- Tape Mount* High Quality DEF Cap Cover* Made Of Chrome Plated Plastic * Double Sided Tape Mount* Sold Individually* Warranty On DEF Cap Cover Against Defects In Workmanship &...
    29-06070001
    SKU:
    29-06070001
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Mack
    Make:
    Volvo
    Finish Options:
    Chrome-Plated
    Product Type:
    Fuel Tanks
    Availability:
    Ready To Ship
    $12.46
    Qty in Cart: 0
    Price:
    $12.46
    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
    Availability:
    Ready To Ship
    $79.99
    Qty in Cart: 0
    Price:
    $79.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit 3 Inch 8 TPI NPSL Non-Locking Fuel Cap With Pressure Relief For International, Mack, Volvo

    BESTfit 3 Inch 8 TPI NPSL Non-Locking Fuel Cap With Pressure Relief For International, Mack, Volvo

    BESTFIT TRUCK PARTS

    $43.70
    Non Locking, Non Vented Fuel Tank Cap 8 TPI NPSL By BESTfitThis non-vented fuel cap is designed to fit various models, featuring a non-locking mechanism with pressure relief. With its 3-inch size and...
    29-060308
    SKU:
    29-060308
    Diameter Options:
    3 Inch
    Truck Class:
    Heavy Duty
    Style Options:
    Non Vented
    Make:
    Volvo
    Make:
    International
    Make:
    Mack
    Product Type:
    Fuel Tanks
    Availability:
    Ready To Ship
    $43.70
    Qty in Cart: 0
    Price:
    $43.70
    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:
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Frequently Asked Questions About Mack CX Truck Fuel Tank Caps

Will this fuel tank cap fit my Mack CX truck?

Fuel tank caps for the Mack CX are typically designed to match the neck diameter and thread pattern used on this model's fuel tanks, but fitment can vary depending on the tank manufacturer and the specific year of your truck. Always check the listed specifications and compare them to your existing cap or tank neck before ordering to ensure a proper fit.

What materials are these fuel tank caps made from, and which one should I choose?

Mack CX fuel tank caps are commonly available in chrome-plated steel, stainless steel, or durable plastic construction. Chrome and stainless steel options offer a polished look and added corrosion resistance, making them a popular choice for trucks that see a lot of road exposure, while plastic caps are typically lighter and more budget-friendly. Your choice often comes down to the balance of appearance, durability, and budget you're looking for.

Is this cap vented or non-vented, and does it matter?

Fuel tank caps can be either vented or non-vented, and using the correct type matters for proper fuel system function. Installing the wrong style can cause fuel delivery issues or venting problems. Check your truck's original cap or owner's documentation to confirm which type your Mack CX requires before purchasing a replacement.

Does this cap include a locking feature, and how does it work?

Many replacement fuel tank caps for the Mack CX are available in locking versions to help deter fuel theft and tampering, typically operated with a included key. Non-locking caps are also available for those who don't need this feature. Be sure to check the product listing to confirm whether a lock and key are included or sold separately.

How do I install a new fuel tank cap on my Mack CX?

In most cases, installation simply involves removing the old cap by unscrewing it counterclockwise from the fuel tank neck, then threading the new cap on by hand in its place. No special tools are typically required. If your cap includes a tether or safety strap, make sure it's properly secured to the fuel tank before use.


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