Stant 10511 Locking Fuel Cap
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Product Description
Stant locking gas caps are OEM quality both in construction and materials as well as deterrent to fuel theft and vandalism. A gas/fuel cap performs three very important functions; safety of the vehicle's occupants, fuel economy and reduce emissions. Safety: Without a fuel cap, gasoline vapors will be present around your car at all times. Those vapors can be ignited by a random spark or flame and are very dangerous if you are involved in an accident or rollover. Fuel Economy: According to Sun Oil Company research, a vehicle with a missing or inoperative fuel cap will allow 176 pounds (22 gallons) of gasoline to evaporate over the period of one year. Emissions: Gasoline vapors emit hydrocarbons which dissolve the earth's ozone layer and cause smog.
Product Details
- Amazon Sales Rank: #2408 in Automotive
- Brand: Stant
- Model: 10511
- Number of items: 1
- Dimensions: 3.10" h x 3.60" w x 3.80" l, .30 pounds
Features
- A quality locking mechanism deters fuel theft and vandalism
- Original equipment performance and safety standards
- OEM quality construction and materials
- Replacing an old, leaky or missing gas cap can save as much as a gallon of gas every 15 days
- A new gas cap can pay for itself in less than three months.

Customer Reviews
Most helpful customer reviews
13 of 14 people found the following review helpful.
Stant 10511 Locking Fuel Cap
By M.A.K
This Cap is for the 2005 Chevy Silverado Extended Cab 2WD.
There are two separate fuel cap designs that GM made for this truck. One has a threaded neck and one does not have a threaded neck. You have to look at the original fuel cap that came with your truck. My truck originally came with a non locking non threaded fuel cap from the factory. So I replaced it with the Stant 10511 locking fuel cap. You cannot find these anywhere! Pepboys, Kragen, Autozone etc! I found it on Amazon finally! It is a quality locking fuel cap. Do not buy Fram fuel caps as they cause your check engine light to come on!
6 of 6 people found the following review helpful.
works
By Tom D
lost my gas cap and my engine light was on. bought this, installed it and the light went out a few miles after driving. helps preventing people from stealing your gas and doesnt let your enemies put anything in your tank. fit my h3 well
4 of 4 people found the following review helpful.
Might be nice if it worked. . .
By Theseus
I ordered this as well as the Motorad locking cap for my truck for comparison's sake. Well, the first Stant locking cap I received from Amazon did not actually lock. The locking mechanism was apparently broken. Now bear in mind that I had no trouble with the other locking cap AND I've had plenty of locking gas caps in the past, from various manufacturers, and never had any trouble with them, either. I can say that the key in this first one did, in fact, turn 90-degrees stop to stop, but it seemingly had no effect on the cap whatsoever. I tried this both with the cap on the fuel filler tube as well as by hand. It worked neither place, though it did fit my truck perfectly well.
Of note, the "instructions" for the cap are actually printed on the cap itself, though strangely not on the box. It's a strange mechanism, but I suppose it works. To "lock" the cap, just put the cap on the filler tube and tighten until it clicks three times. No key necessary (a plus compar ed to most locking gas caps). At this point, the cap spins freely to the left (unscrew) but tightens if turned to the right, only to a point before it then clicks to release the tension. To unlock, insert the key, turn counterclockwise 1/4 turn and then back, remove the key and unscrew the cap.
None of this, of course, worked on the first cap I received. So I asked Amazon to swap it out for me, and they did (quickly and painlessly, thanks Amazon!).
The second cap worked as it is supposed to. The moral to this story is that quality control is critical, especially on a locking cap. This does, in fact, make me a little nervous about using this cap long term. We'll see.
Anyway, this cap is going on a 2008 GMC Sierra Denali. Note that you MUST make sure you have the right cap for the application. One cap does not fit all. Amazon fitment guide did steer me to this cap and it fits just fine.
This cap looks very similar to the stock GM cap except with a key mechanism in the top. The key is bare metal, which makes it slimmer, but also may scratch up the key fob (if you care about such things).
Otherwise, this appears to be effective but nothing fancy. I'm not sure what it'd take to get a 5-star review (chrome? spinners? rhinestones?), but given the apparent dud I got the first go round, I'm not comfortable giving this one a 4-star review, either. Thus a 3-star review for a 3-star product.