Locking fuel caps and key removal during fueling?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Ozdriver, Jul 30, 2021.

  1. Ozdriver

    Ozdriver Heavy Load Member

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    Just bought 4 x locking fuel caps for my KW. Genuine Kenworth items, the round screw-on ones. Only problem is, I just found out you can’t take the key out until they are locked. You can’t take the key out when they are unlocked. A real hassle when you’re filling 4 tanks. I only want to lock them occasionally if I’m in a dodgy area. I rang a locksmith and he said they are designed that way, and the only way to fix it is to mill or grind a groove in the fuel cap body. Anyone done this?
     
    Cat sdp and BoxCarKidd Thank this.
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    No. Sounds correct to me.
    Good to hear from you. It has been long time.
     
  4. Cat sdp

    Cat sdp . .

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    Yes welcome back….

    love your truck…… wish I had 4 tanks….
     
  5. GEERAVIS

    GEERAVIS Bobtail Member

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    Jun 13, 2020
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    Do they make locking caps or collars for DEF tanks for 2016 KW T680's? I've been looking,
    but nothing so far.
     
  6. RockinChair

    RockinChair Road Train Member

    I have never messed with locking fuel caps, but if you find whatever little piece of metal holds the key in place inside the lock cylinder while the fuel cap is unlocked, just grind it off flush.

    Cool looking truck, BTW.
     
  7. Goodysnap

    Goodysnap Road Train Member

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    Nope never seen one.

    Probably not an issue with theft like there is with fuel.

    If anything It would be helpful to keep away someone from sabotage. DEF contamination is very expensive to fix.

    Is this why you are looking?
     
  8. GEERAVIS

    GEERAVIS Bobtail Member

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    Jun 13, 2020
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    Yes. I have seen coupling locks that fit over top of fuel caps, and was
    thinking that something like that may work. Perhaps I can get someone
    to fabricate a coupling lock for it as well.
     
  9. Goodysnap

    Goodysnap Road Train Member

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    The Paccar DEF fill cap is nothing like I have ever seen in the industry, automotive or otherwise. If you come up with a good solution please share your ideas. I will update here if I see anything.
     
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  10. not4hire

    not4hire Road Train Member

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    I've found locking caps to more trouble than they're worth, but if you insist... I would just have four keys made and keep them on a doohickey like this (or reasonable facsimile).

    [​IMG]
     
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  11. Goodysnap

    Goodysnap Road Train Member

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    Like every other lock and security device on the planet. If the theives want it bad enough, they will get it. They are indeed a huge inconvenience and very problematic.
     
    not4hire Thanks this.
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