Leak Defender® for Kenworths

5.00 out of 5 based on 8 customer ratings
(8 customer reviews)


A 2-Piece Fuel Neck Adapter, Collar & Cap, Which Creates a NEW Sealing Surface & Stops Leaking Fuel Cap Issues on Kenworth Trucks!

NOTE: If you have dual tanks, you will need to purchase 2.

Green_Checkmark Stop Leaking Fuel Cap IssuesGreen_Checkmark Save on Repair Costs
Green_Checkmark No DowntimeGreen_Checkmark Stay DOT-Complaint

In stock (can be backordered)

SKU: LEA-KIT-002 Categories: ,
GET 20% OFF Your Entire Order When You Buy 10 or More!


The Leak Defender® is more then just a shiny new cap….it is a 2-piece adapter consisting of a collar and cap which creates a completely new sealing surface. The Leak Defender® collar attaches to your existing fuel neck, sealing along the outer perimeter, away from the inner perimeter which is prone to nicks and abrasions. The Leak Defender® cap attaches to the collar and is made with the same billet aluminum to withstand the wear and tear of everyday fueling.

NOTE: If you have dual tanks, you will need to purchase 2.

2 Year Warranty100% Satisfaction Guarantee

Additional information

Weight1.633125 lbs
Dimensions5.25 x 5.25 x 3.5 in

Leak Defender®


Billet Aluminum

Compatible With

All Kenworth Models





8 reviews for Leak Defender® for Kenworths

  1. 5 out of 5

    The leak defender stopped our leaking fuel cap problem. I only wish we found out about it sooner… It has already saved us over $4,000 in fuel tank replacement costs!

  2. 5 out of 5

    (verified owner)

    Had problems with a stripped neck on my KW fuel tank, after looking for a way to fix it, i couldn’t believe the price for new necks and the costs to have tanks dropped, cleaned out, and sending off to get them welded in. On top of that price you look at the cost of the down time. I ordered the leak defender for both tanks and could not believe how easy to install, how well they work, and how nice they look!!!! I dont get excited very often over a product, but these are the best. What a great company to deal with, and a pleasure doing business with. Thanks guy’s you saved me a lot of money and down time.

  3. 5 out of 5

    (verified owner)

    Installation was super easy !! Was skeptical at first about if it I’d work , and figured I’d give it a shot with the money back garauntee, and it worked instantly , no more leaking fuel, and I get to keep my tanks polished and looking sharp without any leaking fuel resudue! Awesome product took care of my problem, don’t hesitate just buy it, we’ll worth the $250 , money well spent!!! Thanks for the awesome product!!!

  4. 5 out of 5

    (verified owner)

    just what we were needing to fix our problem ! was easy fast and was the cheapest solution for our situation ! I will use them in the future , thank you

  5. 5 out of 5

    (verified owner)

    The Leak Defender is the best product out there, after trying many solutions and nothing working, we found your website and gave it a shot. Your gas caps are the best we havent had any more issues with fuel leaking. we have saved thousands on fuel.

  6. 5 out of 5

    (verified owner)

    Easy install and works as described, the money saved is well worth the cost.

  7. 5 out of 5

    (verified owner)

    Fast shipping. Quality product and satisfaction of no more leaking fuel tanks could be any happier and will buy again for the other trucks

  8. 5 out of 5

    Awesome product

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