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  • Here is what you get with a typical Fuel Tank Lock (Noise reduction gaskets, locking "collar") Note: Pete's do come with a locking collar.
  • Optional step: Install noise reduction gasket on top of fuel cap.
  • Install noise reductions on clean fuel tank (gaskets are diesel resistant and self-adhesive)
  • Install locking collar and fuel cap.
  • Ensure bottom "teeth" of the fuel cap lock engage the locking collars.
  • Enjoy anti-siphon peace of mind.
  • Unit that fits Peterbilt-style fuel tanks- closed
  • Unit that fits Peterbilt-style fuel tanks- open.
2.00 LBS
Minimum Purchase:
1 unit(s)

Product Description

Click on Part Number or Description below to find the fuel tank lock that fits your truck:

Note: We currently have in stock only units that fit Peterbilt-style tanks.


Part number Fuel tank inlet description / truck: ID on Filler Neck OD on Filler Neck OD of Fuel cap (widest part accross)
FTL-D100 Peterbilt with distinctive Lip 3.2" 4" 4.5", not measuring distinctive "lip"
FTL-D130 Freightliner Push and Turn 2" 3.5" 4.3"
FTL-D251 Refridgerated Trailer "Reefer" 1.875" 2.5" 2.9"
FTL-D252 Box Truck: Freightliner M2 (Medium Duty) 2" 2.5" 3.15"
FTL-D253 Box Truck: GMC 1.875" 2.5" 2.9"
FTL-D254 Box Truck: Hino 1.875" 2.5" 2.9"
FTL-D255 Box Truck: International 1.875" 2.5" 2.9"
FTL-D256 Box Truck: Mitsubishi 1.875" 2.5" 2.9"
FTL-D300 Volvo/Mack 2005 and newer 2.5" 3" 3.55"
FTL-D351 Volvo/Mack pre-2005 3" 3.5" 4"
FTL-D352 International Heavy Duty 3" 3.5" 4.2"
FTL-D353 Sterling Heavy Duty 3" 3.5" 4.2"
FTL-D354 Western Star Heavy Duty 3" 3.5" 4.2"
FTL-D355 Freighliner: Screw cap 2.7" 3.5" 4.2"
FTL-D356 Kenworth Heavy Duty 2.5" 3.5" 4"
FTL-D428 DAF, IVECO, SCANIA, VOLVO, MERCEDES. Fits over "Bayonette cap" and with filler neck ID 80mm and OD 105mm. (e.g.:  Mercedes-Benz T.I.R, Volvo T.I.R, Daf T.I.R, Scania T.I.R, Man T.I.R, Iveco T.I.R, Fiat T.I.R) 3.15" / 80mm 4.14" / 105mm 4.64" / 118mm
FTL-D536 DAF, IVECO, SCANIA, VOLVO, MERCEDES.  Fits over screw cap and with filler neck ID 60mm and OD 84mm (e.g.: Scania 4, P,G,R,T Series truck) 2.36"/ 60mm 3.3" / 84mm 3.8" / 97mm


Fuel tank access prevention

Keep fuel in; Keep junk out!

Ideal for owner operators and small fleets. Helps to eliminate fuel theft and sabotage (grass clippings, plastic bags etc. forced into your fuel tank.)

Revolutionary design!

  • Most compact!
    Fits in more tight areas than any similar lock design. Fits behind truck skirts, below fiberglass "door access openings", and even close to “steps” on box trucks.
  • Dust cap helps to protect the locking mechanism.
    The key hole is now protected against water, grime and dust. The dust cap itself is diesel resistant.

  • Easy to use while wearing gloves!
    The key is only needed to unlock the unit. You can put the key away while you refuel. Simply slide the unit together and push down on the tumbler to lock! Its so easy that a little kid can do it!

  • Easy to use in cold weather and durable!
    Made from components designed to withstand the harshest of weather and chemical conditions.
  • Good looking design with shiny finish; easy to clean and can be polished to an original high shine with a simple wax.

Highest quality!

  • The casting is made from aircraft grade aluminum and is die casted under a whopping 450 ton of pressure for added strength and precision.
  • Your locking collar is made from stainless steel (no collar for Peterbilt style tanks)
  • The oversized lock offers higher degree of protection
  • Diesel-resistant noise reduction gaskets (not just any old rubber that gets eaten away…)
  • Two keys

Helpful hints:

Be sure to write down your key code somewhere where you can find it in the future (We recommend inside the the glove compartment of your truck). The key code can be found in two places: a) the keys themselves, b) on the body of the lock which is itself nestled inside the fuel tank lock (harder to find).

Keys are expensive and time-consuming to replace – be sure to keep one key in a secure place for future emergencies. Keep it separate from the other key that you ordinarily would use.


Product Videos

Fuel Tank Lock Movie v01 02:10

See the latest fuel tank lock design from DIESEL Keeper. Fits over most heavy duty trucks and medium duty trucks, provided fuel cap is less than 4" in OD.

  • Fuel Tank Lock...
    See the latest fuel tank lock design from DIESEL Keeper. Fits ...

Product Reviews

Write Review

  1. redesign worth waiting for

    Posted by Unknown on 23rd Nov 2015

    I like the fact that I can lock it up without using the key..
    The finish makes it look like a shiny accessory..
    Look forward to cold weather to see how it holds up