Locking fuel and DEF caps
I see you have a 2021 so you should have a 22A model. It seems your cap functions different from the older trucks like mine.
https://www.bem-auto.com/product-pag...22-ford-diesel
I'd contact them if you haven't.
Good luck.
I’ll contact them and see what they say.
Good luck with them brother...
It would be the upper male thread there, for lack of a better description for it.
But after the rain, there was water on the caps and inside the fuel filler compartment. So I can see why my Tank Warden set froze up because water gets inside and there's no seal under the lock to prevent moisture from getting in.
Even water on the DEF cap...
Loosened up the screw about 6 to 6.5 half turns which was enough to loosen it to take off the cap.
In position to remove it...
What the screw looks like.
Had to take the church key (bottle opener) off the ring because it's a PITA when you're turning the key to loosen/tighten. I keep it separate in the 3rd seat console.
Was the Tank Warden nice with its quarter turn to unlock and lock? Yes... so it takes a little bit longer to get off and on, but no big deal IMO.
My auto locking hubs weren't working this winter so I used them like traditional locking hubs like my 96 had... no big deal.
For this upcoming winter, I am not anticipating any problems but will post up when it's time.
Last edited by Overkill2; Apr 19, 2025 at 11:39 AM. Reason: Correct post
I see you have a 2021 so you should have a 22A model. It seems your cap functions different from the older trucks like mine.
https://www.bem-auto.com/product-pag...22-ford-diesel
I'd contact them if you haven't.
Good luck.
I guess I have undersirable mootions described in the last line....my cap sometimes just falls to the ground when I open my fuel door....definitely undesireable.
its a gimmick cap....theres no "lock" in it...a pair of needle nose pliers can remove the gimmick screw. mine has course threads so you try to lock it...then you can jiggle the cap..then lock it some more...jiggle the cap again...lock it down some more. then after a long drive you open the fuel door and the cap falls to the ground. wouldnt do that iif it had a lock and key step cap. I didnt know it was a screw based friction lock if I did I would not have bought it.
with all the bad press the bem caps have you are better off staying clear of them.
I dont like dealing with comapnies that make you do a photo shoots and back and fourth did you do this and that email exchanges....If I say the product is broke and it needs to be fixed its on your dime not mine.
with all the bad press the bem caps have you are better off staying clear of them.
I dont like dealing with comapnies that make you do a photo shoots and back and fourth did you do this and that email exchanges....If I say the product is broke and it needs to be fixed its on your dime not mine.
Please pardon me if my commentary seems harsh, but, boy oh boy did I get a laugh out of this. Sounds like you have no real problem with the “gimmick” lock or your experience if you don’t want to report it to a small mom-and-pop business. Comes across like sour grapes. I mean really, gimmick? Ridiculous.
Come on, brother, photos and videos of the BEM Auto products have been available online since 2018…so your gripe of “if I had only known…” falls flat. I tell you when I’m fixing to drop $150+ for an unknown product, that’s enough incentive to search the web for reviews and information.
As far as bad press, I never heard any. I have heard the folks over at Subtle Design (Tank Warden brand mfg) on the Tremor forum trying to drag BEM Auto for some unknown reason, but that’s obviously a conflicted position since they’re trying to carve out a spot for themselves. BEM told me a couple years ago that they wished the Tank Warden mfg the best success and was even thinking about contacting Subtle Design to help bank roll their production when they were hitting snags a few years ago. I am guessing BEM went a different route after some unprofessional commentary from SD online. Who knows?
I still talk to folks who told me they bought the Tank Warden set after a recommendation by Nicole at BEM Auto. Comes across as really good character to me…so what bad press??
So…if you’re dealing with a frictionless “friction” lock (defective product)…that seems like something you’d contact BEM Auto about. My guess is that it’s user error or…some ulterior motive…that keeps you from calling them.
I’ve dealt with BEM years after a purchase. Call them with a problem and they pay to get the product back from me and give service reports and/or product exchanges. I have no idea what it hurts to ask a user to describe their experience verbally or in photos in order to see whether there’s a problem with the product or with the use. I mean, whenever I call any manufacturer for troubleshooting, they want a description of what is going on.
What’s the issue with helping a customer prior to purchase in the case of some doubt on compatibility? Seems like you’re taking exception with over the top decent customer service…over the information you refuse to reveal to the manufacturer. Best of luck with that brother.
Ford Trucks for Ford Truck Enthusiasts
with all the bad press the bem caps have you are better off staying clear of them.
I dont like dealing with comapnies that make you do a photo shoots and back and fourth did you do this and that email exchanges....If I say the product is broke and it needs to be fixed its on your dime not mine.
I'm just trying to help you out. Maybe they will buy it back if you don't want to use a different cap to resolve the issue, which is okay, then they can get information from you so they can help out the next guy who maybe has the same truck as yours or the same problem as yours.
When I get a chance, I'll post all the part different part numbers for these different fuel filler pipes from the research i did. Maybe you had a one off different filler pipe that caused this issue but as to mine, it works, is locked down and does not move when I drove the truck.
The problem I had at first was that the scallop shaped rubber gasket, "U" in shape, did not open up at first causing the screw to not come down flush all the way, and bottom out on the machined screw hole surface. With the screw in that position, head above the hole, then yes, someone could grab it with a set of Vice grips or needle nose pliers.
But if yours was flush down all the way, like mine was, and still was wiggling and loose, and then came off the filler pipe, then I'm thinking that the cap was not compatible with your specific filler pipe, if in fact yours was not the standard 17 to 19 part number here, HC3Z-9034-C, for whatever reason. Your truck uses a HC3Z-9030-D filler cap.
My truck has two listed for my CCSB with a WB of 156, BC3Z-9034-EJ or EN. My filler cap is a HC3Z-9030-B. But there are also 3 other filler caps listed for mine as well as yours, including my filler cap that I posted up there.
Confusing? **** yeah. I have a whole sheet with all kinds of part numbers on it because I'm that guy...

The only reason I did the back and forth was to try to find out if it would work with my MY truck after what I read on the website before I bought it. Then Nicole offered to ship it out to me free... incredible service. Not saying they will do this for everyone, but maybe all the back and forth, using my full name, she pretty much figured I was legit
I really do not anticipate any problems with my set. I just want a set that will function in the winter weather and not be affected by frozen moisture like the Tank Warden set.
As to unscrewing the screw with a set of needle nose pliers, when it's flush in the hole, that's going to be a big negative.
These would not fit in the hole.
Not even close...
These **** ers did and guess what?
Even though they had teeth for grip, they kept slipping off the screw. No go.
I have one more set of NNPs in the tool bag in my truck that IIRC, are a little smaller than the second set I posted with black and blue handles. I'll check tomorrow but no way will that screw turn once down tight. I crank it a little so it's more than just snug but not crazy. If I break a key, I have a second one but would order two more.
Not trying to bust your chops Fritz but I really don't know why you won't see if they could make this right for you brother...
Have a good night...
On my recent return home trip from the Keys I left the caps unlocked to make refueling easier over 1500 miles. The Torklift Fast Gun blocked the fuel door so I didn’t really need to lock it while traveling.
On my recent return home trip from the Keys I left the caps unlocked to make refueling easier over 1500 miles. The Torklift Fast Gun blocked the fuel door so I didn’t really need to lock it while traveling.
When I stated 3 or so turns to ve able to spin and take off the fuel cap, I meant 6 half turns, so one turn is equal to 2 turns of the key where the handles end up, almost like a clock... where 12 hours is a half turn..
It is a pain somewhat coming from the quarter turn lock/unlock of the fancing casino lock thats on the Tank Warden set, but freezing up completely in the winter cold temps doesn't work for me.
I really don't have an issue with doing it, not as convenient, but like that it's a solid piece of machined aluminum and feels way more secure than the Tank Warden set. And cheaper too...
When I stated 3 or so turns to ve able to spin and take off the fuel cap, I meant 6 half turns, so one turn is equal to 2 turns of the key where the handles end up, almost like a clock... where 12 hours is a half turn..
It is a pain somewhat coming from the quarter turn lock/unlock of the fancing casino lock thats on the Tank Warden set, but freezing up completely in the winter cold temps doesn't work for me.
I really don't have an issue with doing it, not as convenient, but like that it's a solid piece of machined aluminum and feels way more secure than the Tank Warden set. And cheaper too...
I have a really difficult time unscrewing the DEF cap only because of that caustic fluid getting on the threads of the opening. Sheez does that get bound up when that DEF shiz dries. Think I am going to add a lil petroleum jelly to the threads on the opening.
When I stated 3 or so turns to ve able to spin and take off the fuel cap, I meant 6 half turns, so one turn is equal to 2 turns of the key where the handles end up, almost like a clock... where 12 hours is a half turn..
It is a pain somewhat coming from the quarter turn lock/unlock of the fancing casino lock thats on the Tank Warden set, but freezing up completely in the winter cold temps doesn't work for me.
I really don't have an issue with doing it, not as convenient, but like that it's a solid piece of machined aluminum and feels way more secure than the Tank Warden set. And cheaper too...












