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          Gates 31778DKA Fuel Tank Cap

          SKU: 123|31778DKA
          GATES Fuel Tank Cap — OE-grade replacement for reliable performance. Fits multiple makes/models such as Ford F-450 Super Duty, Volvo 244 and Toyota Camry.
          0.0
          Gates
          Vehicle Specific
          Check if this part fits your vehicle.
          • Placement on Vehicle: Drive Belt
          • $42.00
          Out of stock
          1-year warrantyAll parts covered
          Secure checkoutSSL encrypted
          Free returns30-day no hassle
          Same-day shippingOrder before 3 PM EST

          GATES 31778DKA Fuel Tank Cap

          Verify fitment before purchase — please check the Fitment section below.

          Key Specifications

          • Brand: GATES
          • Manufacturer Part Number: 31778DKA
          • Part Type: Fuel Tank Cap
          • Condition: New
          • Warranty: 1 Year

          Vehicle Compatibility

          Fits select vehicle applications. Please enter your vehicle or check the Fitment section below to confirm compatibility.


          Keep your fuel and DEF systems sealed and secure with this Gates Fuel Tank Cap. Designed to prevent leaks and contamination, it helps maintain proper system operation and protects engine and emission performance.

          Why replace this part? Cracked, loose, or damaged filler components can allow leaks, contamination, or vapor loss. Replacing worn parts helps maintain proper sealing, prevent warning lights, and ensure safe, compliant fueling or DEF system operation.

          Key Features & Benefits

          • Secure sealing — Helps prevent leaks and contamination in fuel or DEF systems.
          • Durable materials — Resistant to chemical exposure and environmental conditions.
          • OE-style fit — Designed to match original specifications for proper operation.
          • Reliable performance — Supports safe, consistent refueling and fluid storage.
          Product Overview

          Build Quality & Materials

          • Constructed from high-quality plastics and metals to resist corrosion and chemical exposure.
          • Designed to maintain a secure, reliable seal during fuel or DEF filling operations.
          • Materials are chosen for durability and long service life under varying temperature and environmental conditions.

          Installation Notes

          • Depressurize the fuel or DEF system before removing caps or filler components.
          • Check sealing surfaces for damage and ensure a proper fit during installation.
          • Verify there are no leaks and that the component functions correctly after installation.

          Why Choose Gates?

          Gates is a global leader in power transmission and fluid transfer solutions, delivering products that help keep engines running efficiently and reliably. With a focus on precision engineering and durability, Gates components support optimal performance under real-world driving conditions.

          • Proven expertise in belts, hoses, and engine components for over a century.
          • Products engineered to meet or exceed OEM specifications.
          • Durable materials and designs validated through rigorous testing for reliability.
          • Trusted by professional technicians and enthusiasts for dependable performance.

          Gates Engineering Advantage

          Gates continually innovates to improve engine performance and component longevity. Advanced design, material selection, and testing ensure Gates products provide consistent power transfer, fluid delivery, and long-term reliability across a wide range of vehicles.

          Shipping & Warranty

          • Fast U.S. shipping from our warehouse on business days.
          • Free returns if the part does not fit or you are not satisfied (see store policy for details).
          • 1-year warranty on this part from date of purchase.
          Product Information

          Item Specifics (Technical)

          • Type: Diesel Only Keyed Alike Fuel Cap
          • Lockable: Yes
          • Cam Type: Quick-On
          • Venting Type: Pressure Vacuum
          • Shell Outside Diameter: 2.91 IN
          • Thread Diameter: 1.77 IN
          • Depth: 2.61 IN
          • Color: Black

          Interchange Part Numbers

          • 17591D
            • SKU
              123|31778DKA
            • Weight
              1 lbs
            • Manufacturer Part #
              31778DKA
          • Brand
            Gates
          • Placement on Vehicle
            Drive Belt
          • Manufacturer
            Gates
          • MPN
            31778DKA
          • Part Type
            Fuel Tank Cap
          • Interchange Part Number
            17591D
          • Mfr Label
            Diesel Only Keyed Alike Fuel Cap

          Shipping Policy – DTautoparts

          We ship all orders from our U.S. warehouses with USPS, UPS, or FedEx.

          Processing Time

          • Orders placed before 3 PM EST ship the same day

          • Others ship next business day

          Transit Time

          • Standard shipping: 2–5 business days

          • Expedited shipping: 1–3 business days (optional at checkout)

          Shipping Rates

          • Free standard shipping on all orders

          • Expedited options available at checkout

          Tracking

          All orders include tracking information, emailed automatically once shipped.

          Lost Packages

          If a package is lost in transit, we will:

          • Start an investigation with the carrier

          • Resend the order or issue a full refund if confirmed lost

          Incorrect Addresses

          If the address is incorrect when the order ships:

          • Carrier may return the package

          • We can resend (buyer pays reship fee) or refund the order

          Return Policy – DTautoparts

          At DTautoparts, we want every customer to be fully satisfied with their purchase.
          If an item does not fit your vehicle or you are not fully satisfied, we offer hassle-free returns.

          Return Window

          • Returns accepted within 30 days of delivery.

          • Items must be returned in their original condition unless the item was defective or damaged on arrival.

          Free Returns

          • If the part doesn’t fit, or arrives damaged, we provide a free return shipping label.

          Customer-Responsibility Returns

          (used, installed, incorrect item ordered, changed mind)

          • Buyer pays return shipping.

          • Item must be unused, uninstalled, and in original packaging.

          Incorrect / Defective Parts

          If the part is faulty, damaged, or the wrong item was sent:

          • We will provide a free return label

          • And issue a full refund OR send a replacement

          Refund Time

          Refunds are processed within 2–3 business days after the returned item is received and inspected.

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          We accept the following payment methods:

          Accepted payment methods


          Warranty

          All parts sold by DTautoparts LLC are backed by a 1-year warranty.

          What’s Covered

          • Manufacturing defects

          • Premature failure

          • Broken components not caused by external damage

          What’s Not Covered

          • Normal wear and tear

          • Improper installation

          • Damage from accidents or abuse

          • Modified or altered parts

          How to Request a Warranty Claim

          Please contact us with:

          • Order number

          • Description of the issue

          • Photos or videos of the problem

          We will:

          • Review the claim in 24–48 hours

          • Provide a replacement or refund if approved

          • Fitment Type
            Vehicle Specific
          YearMakeModelSubmodelNotes
          1980Volvo264GL (2.4L L6 DIESEL)
          1980Volvo264GLE (2.4L L6 DIESEL)
          1980Volvo265GLE (2.4L L6 DIESEL)
          1981Volvo264GL (2.4L L6 DIESEL)
          1982Volvo244DL (2.4L L6 DIESEL)
          1982Volvo244GL (2.4L L6 DIESEL)
          1982Volvo245DL (2.4L L6 DIESEL)
          1983Volvo244GL (2.4L L6 DIESEL)
          1983Volvo245GL (2.4L L6 DIESEL)
          1983Volvo760GLE (2.4L L6 DIESEL Turbocharged)
          1983Volvo760GLE (2.4L L6 DIESEL)
          1984ToyotaCamryDLX (1.8L L4 DIESEL Turbocharged)
          1984ToyotaCorollaDLX (1.8L L4 DIESEL)
          1984ToyotaPickupDLX (2.4L L4 DIESEL)
          1984Volvo244DL (2.4L L6 DIESEL)
          1984Volvo244GL (2.4L L6 DIESEL)
          1984Volvo245Base (2.4L L6 DIESEL)
          1984Volvo760GLE (2.4L L6 DIESEL Turbocharged)
          1984Volvo760GLE (2.4L L6 DIESEL)
          1985ToyotaCamryDLX (1.8L L4 DIESEL Turbocharged)
          1985ToyotaCorollaDLX (1.8L L4 DIESEL)
          1985ToyotaPickupDLX (2.4L L4 DIESEL)
          1985ToyotaPickupDLX Turbo (2.4L L4 DIESEL Turbocharged)
          1985Volvo740GLE (2.4L L6 DIESEL Turbocharged)
          1985Volvo745GLE (2.4L L6 DIESEL Turbocharged)
          1985Volvo760GLE (2.4L L6 DIESEL Turbocharged)
          1986ToyotaCamryDLX (1.8L L4 DIESEL Turbocharged)
          1986ToyotaCamryDLX (2.0L L4 DIESEL Turbocharged)
          1986Volvo740GLE (2.4L L6 DIESEL Turbocharged)
          1999FordE-450 Econoline Super DutyBase (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          1999FordF-450 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          1999FordF-450 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          1999FordF-450 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          1999FordF-550 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          1999FordF-550 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          1999FordF-550 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2000FordE-450 Econoline Super DutyCustom (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2000FordF-450 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2000FordF-450 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2000FordF-450 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2000FordF-550 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2000FordF-550 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2000FordF-550 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2000FordF-650Base (7.3L 444cid V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2000FordF-750Base (7.3L 444cid V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2001FordE-450 Econoline Super DutyCustom (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2001FordF-450 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2001FordF-450 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2001FordF-450 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2001FordF-550 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2001FordF-550 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2001FordF-550 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2001FordF-650Base (7.3L 444cid V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2001FordF-750Base (7.3L 444cid V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordE-450 Econoline Super DutyCustom (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordE-550 Econoline Super DutyCustom (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordF-450 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordF-450 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordF-450 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordF-550 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordF-550 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordF-550 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordF-650Base (7.3L 444cid V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2002FordF-750Base (7.3L 444cid V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordE-450 Super DutyCustom (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordE-550 Super DutyCustom (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordF-450 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordF-450 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordF-450 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordF-550 Super DutyLariat (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordF-550 Super DutyXL (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordF-550 Super DutyXLT (7.3L V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordF-650Base (7.3L 444cid V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2003FordF-750Base (7.3L 444cid V8 DIESEL Turbocharged)With Threaded Filler Neck;
          2004ChevroletSilverado 2500 HDBase (6.6L V8 DIESEL Turbocharged)
          2004ChevroletSilverado 2500 HDLS (6.6L V8 DIESEL Turbocharged)
          2004ChevroletSilverado 2500 HDLT (6.6L V8 DIESEL Turbocharged)
          2004ChevroletSilverado 2500 HDWT (6.6L V8 DIESEL Turbocharged)
          2004ChevroletSilverado 3500Base (6.6L V8 DIESEL Turbocharged)
          2004ChevroletSilverado 3500LS (6.6L V8 DIESEL Turbocharged)
          2004ChevroletSilverado 3500LT (6.6L V8 DIESEL Turbocharged)
          2004ChevroletSilverado 3500WT (6.6L V8 DIESEL Turbocharged)
          2006GMCC4500 TopkickC4C042 (6.6L V8 DIESEL Turbocharged)
          2006GMCC4500 TopkickC4C044 (6.6L V8 DIESEL Turbocharged)
          2006GMCC4500 TopkickC4E042 (6.6L V8 DIESEL Turbocharged)
          2006GMCC4500 TopkickC4E044 (6.6L V8 DIESEL Turbocharged)
          2006GMCC4500 TopkickC4U042 (6.6L V8 DIESEL Turbocharged)
          2006GMCC4500 TopkickC4V042 (6.6L V8 DIESEL Turbocharged)
          2011GMCSavana 4500Base (6.6L V8 DIESEL Turbocharged)
          2012ChevroletExpress 4500Base (6.6L V8 DIESEL Turbocharged)
          2012GMCSavana 4500Base (6.6L V8 DIESEL Turbocharged)
          2013GMCSavana 4500Base (6.6L V8 DIESEL Turbocharged)
          2015GMCSavana 4500Base (6.6L V8 DIESEL Turbocharged)
          2016GMCSavana 4500Base (6.6L V8 DIESEL Turbocharged)

          Frequently Asked Questions

          Does this part fit my vehicle?

          Use the Year/Make/Model selector at the top of the page.
          If unsure, contact us — we respond within minutes.

          Is this part new or used?

          All parts are brand-new, factory-fresh, and never used.

          Does this include hardware?

          If included, it will appear in the product images or description.
          If not listed, assume hardware is not included.

          What if the part doesn’t fit?

          No problem — we offer free returns on items that do not fit your vehicle.

          What warranty does this part come with?

          Every part includes a 1-year warranty.

          How fast do you ship?

          Orders before 3 PM EST ship the same day.