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Peterbilt 386 Fuel Tank Caps

If you've misplaced your fuel tank cap, don't fret! We've got you covered with our selection of aftermarket fuel tank caps for the Peterbilt 386. Browse our range of replacement vented, unvented, locking, and non-locking gas caps. Let's help you find the perfect fit for your needs!
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  • Polished Fuel Tank Guard Cover And Latch W/ 4.25 Inch Neck Opening For Peterbilt

    Polished Fuel Tank Guard Cover And Latch W/ 4.25 Inch Neck Opening For Peterbilt

    AFTERMARKET

    $167.99
    Lock On Fuel Tank Guard Cover And Latch W/ 4.25 Inch Neck OpeningProtect what powers your truck with this Polished Fuel Tank Guard Cover and Latch built for Peterbilt. The 4.25-inch neck opening...
    01-060315
    SKU:
    01-060315
    Material Options:
    Steel
    Finish Options:
    Polished
    Product Type:
    Fuel Tanks
    Make:
    Peterbilt
    $167.99
    Qty in Cart: 0
    Price:
    $167.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit 4 Inch Non-Locking Lever Style Fuel Cap For Peterbilt

    BESTfit 4 Inch Non-Locking Lever Style Fuel Cap For Peterbilt

    BESTFIT TRUCK PARTS

    $75.99 - $689.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 330 1995 thru 2005* Fits Peterbilt 335 2005 thru 2010* Fits Peterbilt 337 2011 thru 2022* Fits Peterbilt 352 1972 thru 1980* Fits Peterbilt...
    PPR_300546
    SKU:
    PPR_300546
    Truck Class:
    Heavy Duty
    Product Type:
    Fuel Tanks
    Material Options:
    Aluminum
    Diameter Options:
    4 Inch
    Style Options:
    Non Vented
    Make:
    Peterbilt
    Ready To Ship:
    Yes
    $75.99 - $689.99
    Qty in Cart: 0
    Price:
    $75.99 - $689.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit 4 Inch Aluminum Non-Vented Lever-Style Locking Fuel Cap With Pressure Relief For Peterbilt

    BESTfit 4 Inch Aluminum Non-Vented Lever-Style Locking Fuel Cap With Pressure Relief For Peterbilt

    BESTFIT TRUCK PARTS

    $100.99 - $883.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 330 1995 thru 2005* Fits Peterbilt 335 2005 thru 2010* Fits Peterbilt 337 2011 thru 2022* Fits Peterbilt 352 1972 thru 1980* Fits Peterbilt...
    PPR_300549
    SKU:
    PPR_300549
    Material Options:
    Aluminum
    Style Options:
    Non Vented
    Truck Class:
    Heavy Duty
    Product Type:
    Fuel Tanks
    Make:
    Peterbilt
    Ready To Ship:
    Yes
    $100.99 - $883.99
    Qty in Cart: 0
    Price:
    $100.99 - $883.99
    Subtotal:
  • 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:
  • FREE SHIPPING OVER $249
    BESTfit Rubber Fuel Cap Gasket For Peterbilt

    BESTfit Rubber Fuel Cap Gasket For Peterbilt

    BESTFIT TRUCK PARTS

    $13.17
    Replacement O-Ring Gasket By BESTfit Fits Peterbilt Lever Lock Style Fuel CapsPrevent dirt and dust from entering your fuel tank with this fuel cap gasket. It is made from nitrile butadiene rubber...
    01-060309
    SKU:
    01-060309
    Truck Class:
    Heavy Duty
    Product Type:
    Fuel Tanks
    Make:
    Peterbilt
    Diameter Options:
    3 3/4 Inch
    Material Options:
    Rubber
    Ready To Ship:
    Yes
    $13.17
    Qty in Cart: 0
    Price:
    $13.17
    Subtotal:
  • FREE SHIPPING
    Polished Billet Aluminum Fuel Cap Covers For Peterbilt W/ T Style Handle

    Polished Billet Aluminum Fuel Cap Covers For Peterbilt W/ T Style Handle

    LIFETIME NUT COVERS

    $385.99
    Fuel Cap Covers Polished Billet AluminumThis pair of fuel cap covers are made of polished billet aluminum. They are designed for fuel caps with a T style handle and mount easily with screws. The...
    01-060300
    SKU:
    01-060300
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Product Type:
    Fuel Tanks
    Material Options:
    Aluminum
    Make:
    Peterbilt
    Ready To Ship:
    Yes
    $385.99
    Qty in Cart: 0
    Price:
    $385.99
    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:
  • Chrome Plastic Locking Fuel Cap Cover For Peterbilt

    Chrome Plastic Locking Fuel Cap Cover For Peterbilt

    UNITED PACIFIC

    $9.22
    Locking Fuel Cap Cover Chrome Plastic By PeterbiltThe locking fuel cap cover is made of durable injection-molded plastic and features a sleek chrome finish thanks to a triple plating process. It has...
    01-06010054
    SKU:
    01-06010054
    Product Type:
    Fuel Tanks
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Ready To Ship:
    Yes
    $9.22
    Qty in Cart: 0
    Price:
    $9.22
    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:
  • Fuel Cap Cover For Peterbilt W/ Twist Lever Lock Caps

    Fuel Cap Cover For Peterbilt W/ Twist Lever Lock Caps

    AFTERMARKET

    $101.99
    Fuel Cap Covers W/ Lock CapsThis Locking Fuel Cap Cover fits select Peterbilt models with twist lever lock caps, providing the ultimate guard against fuel and fuel cap theft. It locks over the...
    01-060310
    SKU:
    01-060310
    Material Options:
    Aluminum
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Fuel Tanks
    $101.99
    Qty in Cart: 0
    Price:
    $101.99
    Subtotal:
  • Aluminum Leak Defender Fuel Cap & Anti-Siphon Kit For Peterbilt

    Aluminum Leak Defender Fuel Cap & Anti-Siphon Kit For Peterbilt

    HEAVY TRUCK SOLUTIONS

    $123.99 - $418.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 330 1995 thru 2005* Fits Peterbilt 335 2005 thru 2010* Fits Peterbilt 337 2011 thru 2022* Fits Peterbilt 357 1987 thru 2007* Fits Peterbilt...
    PPR_4933
    SKU:
    PPR_4933
    Capacity:
    100 Gallons
    Position:
    Rear Fill
    Diameter Options:
    26 Inch
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Shape Options:
    Cylindrical
    Make:
    Peterbilt
    Product Type:
    Fuel Tanks
    Ready To Ship:
    Yes
    $123.99 - $418.99
    Qty in Cart: 0
    Price:
    $123.99 - $418.99
    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:
  • FREE SHIPPING OVER $249
    Chrome Plastic DEF Tank Cap Cover For Peterbilt 378, 379, 386, 387, 388, 389

    Chrome Plastic DEF Tank Cap Cover For Peterbilt 378, 379, 386, 387, 388, 389

    LIFETIME NUT COVERS

    $14.66
    Diesel Exhaust Fluid CapThis quality Diesel exhaust fluid cap by Lifetime Nut Covers is constructed of chrome plated plastic. It is sold individually and is made in the USA.* High Quality Diesel...
    01-080503
    SKU:
    01-080503
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Plastic/Poly
    Make:
    Peterbilt
    Finish Options:
    Chrome-Plated
    Product Type:
    Exterior
    Ready To Ship:
    Yes
    $14.66
    Qty in Cart: 0
    Price:
    $14.66
    Subtotal:
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Adding your products to cart

Peterbilt 386 Fuel Tank Caps offer a comprehensive selection of high-quality replacement fuel and DEF caps for Peterbilt trucks. This product lineup includes a wide range of non-vented, lever-style, locking, and pressure-relief caps to meet the diverse needs of Peterbilt owners. Whether you're looking for a direct OEM replacement, a more secure locking cap, or an anti-siphon solution, this product lineup has you covered. The products feature durable construction, secure sealing, and corrosion-resistant finishes to ensure a reliable and long-lasting fuel system. Enhance the performance and protection of your Peterbilt 386 with the top-notch fuel tank caps in this product lineup.

Frequently Asked Questions About Peterbilt 386 Fuel Tank Caps

Will this fuel tank cap fit my Peterbilt 386?

Fuel tank caps are typically designed to match specific thread patterns, neck diameters, and venting styles used on Peterbilt 386 fuel tanks. Before ordering, check the diameter and thread type of your existing cap or tank neck, and compare it to the product specifications listed on the page to confirm a proper fit.

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

Yes, it matters. Vented caps allow air to enter the tank as fuel is drawn out, preventing a vacuum that can restrict fuel flow, while non-vented caps rely on other venting points in the fuel system. Using the wrong type can cause fuel delivery issues or tank pressure problems, so make sure the replacement matches the venting style of your original cap.

What materials are these fuel tank caps made from, and how do they hold up?

Fuel tank caps are commonly available in chrome-plated steel, stainless steel, or durable plastic/composite materials. Metal caps generally offer a more polished look and added durability against road debris and weather exposure, while composite caps can be lighter and resistant to corrosion. Choose based on your priorities for appearance, weight, and long-term durability.

Does a locking fuel cap help prevent fuel theft?

A locking fuel tank cap can add a layer of security by making it more difficult for someone to quickly access your fuel tank. While it is not a guarantee against theft or tampering, many drivers choose locking caps for extra peace of mind, especially during overnight stops or extended parking.

How do I install a replacement fuel tank cap on my Peterbilt 386?

Most fuel tank caps thread directly onto the existing fuel neck by hand, without the need for tools. 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 tether or lock, make sure it is properly secured to avoid loss or damage while driving.


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