HOT! Ford Diesel Locking Fuel and DEF Caps

[DDD]

Mine didn’t come with the “Diesel Only” tag but I can’t say enough about how am impressed with the quality and thoughtful functionality of these. Adds great security too. Worth the money for sure. Thanks BroncOh.

 

[BroncOh]

Mine didn’t come with the “Diesel Only” tag but I can’t say enough about how am impressed with the quality and thoughtful functionality of these. Adds great security too. Worth the money for sure. Thanks BroncOh.

The tag is something @wearenh bought elsewhere.

Thank you! @DDD Glad you're enjoying them.

 

[wearenh]

yes, sorry for not mentioning that

AMAZON

 

[DDD]

Cool. Thanks. It blends in perfectly!

 

[mattagc]

Hmm, very suspicious, my vehicle completes its build and is shipped the same day I get the notices my caps are in the post.

Anyone still waiting on their factory order should try this simple trick!

Just buy @BroncOh products. Haha

 

[STDevil]

Is the DEF cap vented (or is it supposed to be vented)?

The reason I ask is that recently, after a RV trip (about 300 miles towing), my DEF gauge was reading full (when I only had about 1/2 tank), the system did not seem to be injecting DEF (I was not hearing the ticking next to the DPF), and then I got a CEL. My phone said something to the effect that the reactant pressure was too low. After pondering all of this, I decided to remove the DEF cap on the hunch that maybe the tank was not venting. I had to pull the cap off and it turns out that the tank was indeed under vacuum.

I still went to the local gas station. Just as I pulled in, the CEL went off. They pulled a code (P2038). We went to the internet and saw that it was for "Reductant Injection Air Pressure Sensor". Then we went back to the truck and the code was gone and my phone now said everything was OK.

Over the next few miles, the DEF gauge went back to 1/2 tank, and I can hear the injector "ticking" every now and then at the DPF.

I put the old OE cap back on and everything seems to be OK. I experimented with the OE cap and it seems to have a vacuum breaker in it, but the other cap does not seem to be vented.

Has anyone had a problem with a vacuum building up in their DEF tank??

Thanks...

 

[BTMDWLR69]

Is the DEF cap vented (or is it supposed to be vented)?

The reason I ask is that recently, after a RV trip (about 300 miles towing), my DEF gauge was reading full (when I only had about 1/2 tank), the system did not seem to be injecting DEF (I was not hearing the ticking next to the DPF), and then I got a CEL. My phone said something to the effect that the reactant pressure was too low. After pondering all of this, I decided to remove the DEF cap on the hunch that maybe the tank was not venting. I had to pull the cap off and it turns out that the tank was indeed under vacuum.

I still went to the local gas station. Just as I pulled in, the CEL went off. They pulled a code (P2038). We went to the internet and saw that it was for "Reductant Injection Air Pressure Sensor". Then we went back to the truck and the code was gone and my phone now said everything was OK.

Over the next few miles, the DEF gauge went back to 1/2 tank, and I can hear the injector "ticking" every now and then at the DPF.

I put the old OE cap back on and everything seems to be OK. I experimented with the OE cap and it seems to have a vacuum breaker in it, but the other cap does not seem to be vented.

Has anyone had a problem with a vacuum building up in their DEF tank??

Thanks...

Never had an issue until recent visit to 114° Arizona. DEF was at 50% Removed cap heavy hiss vaccum sound released, filled DEF, couldn't get more in, did not get over 86%. I'm around 60% now in Texas, gonna try and refill by tomorrow.

 

[GreyBeard22]

Have a different DEF locking cap, and have no issues like above described. Could it be pressure and or temp normalization related? Like ambient temp or relative pressure change while traveling up and down elevations?

Spit balling here….

 

[STDevil]

Have a different DEF locking cap, and have no issues like above described. Could it be pressure and or temp normalization related? Like ambient temp or relative pressure change while traveling up and down elevations?

Spit balling here….

Not sure about the ideas you mentioned but they are all good ones. I have made several trips just like this (elevation and temperature changes) so it seems weird that the issue just showed up. Hopefully someone who knows more about the DEF system (unlike me...) can chime in and throw out more ideas about what may be going on...

 

[Maxx1776]

ordered a 2nd set of caps for a 2016 , update my 2023 caps are working perfectly no issues

 

[STDevil]

I sent an inquiry to the fabricator and I will let you know what I find out.

 

[wools64]

Is the DEF cap vented (or is it supposed to be vented)?

The reason I ask is that recently, after a RV trip (about 300 miles towing), my DEF gauge was reading full (when I only had about 1/2 tank), the system did not seem to be injecting DEF (I was not hearing the ticking next to the DPF), and then I got a CEL. My phone said something to the effect that the reactant pressure was too low. After pondering all of this, I decided to remove the DEF cap on the hunch that maybe the tank was not venting. I had to pull the cap off and it turns out that the tank was indeed under vacuum.

I still went to the local gas station. Just as I pulled in, the CEL went off. They pulled a code (P2038). We went to the internet and saw that it was for "Reductant Injection Air Pressure Sensor". Then we went back to the truck and the code was gone and my phone now said everything was OK.

Over the next few miles, the DEF gauge went back to 1/2 tank, and I can hear the injector "ticking" every now and then at the DPF.

I put the old OE cap back on and everything seems to be OK. I experimented with the OE cap and it seems to have a vacuum breaker in it, but the other cap does not seem to be vented.

Has anyone had a problem with a vacuum building up in their DEF tank??

Thanks...

Interesting that you bring this up. The last 2x I went to put in Def it def had a vacuum release when I took the cap off. Then today I checked it and the gauge is showing full but it is counting down miles oddly. But I just released the cap and swooosh under vacuum again. I haven't heard any ticking or got an error code but it is now definitely a concern. Will watch to see where this goes.

 

[NightForceFan]

Interesting that you bring this up. The last 2x I went to put in Def it def had a vacuum release when I took the cap off. Then today I checked it and the gauge is showing full but it is counting down miles oddly. But I just released the cap and swooosh under vacuum again. I haven't heard any ticking or got an error code but it is now definitely a concern. Will watch to see where this goes.

Hope you guys get this figured out. Glad I did not swap out my OEM caps.

 

[BroncOh]

Been busy away from the forum transitioning over to FoMoCo.

There's an internal passageway that allows the tank to be at ambient pressure. If any unsintered Nylon blocks this passage, this could allow a buildup of vacuum. This passage can be opened up with a 3/32" drill (depth 29mm from the outside) until you feel the resistance of the drill break through. Normally the passage is obscured through the zip-tie cross hole, which is only used for shipping purposes. Use compressed air to blow anything free.

 

[wools64]

Been busy away from the forum transitioning over to FoMoCo.

There's an internal passageway that allows the tank to be at ambient pressure. If any unsintered Nylon blocks this passage, this could allow a buildup of vacuum. This passage can be opened up with a 3/32" drill (depth 29mm from the outside) until you feel the resistance of the drill break through. Normally the passage is obscured through the zip-tie cross hole, which is only used for shipping purposes. Use compressed air to blow anything free.

Thanks Broncoh

 

[FunTrucking]

Been busy away from the forum transitioning over to FoMoCo.

There's an internal passageway that allows the tank to be at ambient pressure. If any unsintered Nylon blocks this passage, this could allow a buildup of vacuum. This passage can be opened up with a 3/32" drill (depth 29mm from the outside) until you feel the resistance of the drill break through. Normally the passage is obscured through the zip-tie cross hole, which is only used for shipping purposes. Use compressed air to blow anything free.

I’m going to check mine. I don’t think I have a blockage/vacuum but this 23 sucks Def like crazy so it’ll be good to be sure. It’s used 15+ gallons in 12k miles.

 

[STDevil]

Interesting that you bring this up. The last 2x I went to put in Def it def had a vacuum release when I took the cap off. Then today I checked it and the gauge is showing full but it is counting down miles oddly. But I just released the cap and swooosh under vacuum again. I haven't heard any ticking or got an error code but it is now definitely a concern. Will watch to see where this goes.

Are using the locking caps?

 

[STDevil]

Been busy away from the forum transitioning over to FoMoCo.

There's an internal passageway that allows the tank to be at ambient pressure. If any unsintered Nylon blocks this passage, this could allow a buildup of vacuum. This passage can be opened up with a 3/32" drill (depth 29mm from the outside) until you feel the resistance of the drill break through. Normally the passage is obscured through the zip-tie cross hole, which is only used for shipping purposes. Use compressed air to blow anything free.

Big thanks to the supplier for posting the information...and for the "service after the sale"!

 

[yArdbird]

Thanks for posting the information @BroncOh, but my caps don’t have a hole where indicated. Are you suggesting drilling a new hole or should one already be there and the modification is to make sure there isn’t a blockage? I’ll edit with a pic shortly.

 

[BroncOh]

Thanks for posting the information @BroncOh, but my caps don’t have a hole where indicated. Are you suggesting drilling a new hole or should one already be there and the modification is to make sure there isn’t a blockage? I’ll edit with a pic shortly.

That hole in the photo was for visualization purposes. It's obscured normally, as mentioned in the post, in the zip-tie cross hole. The photo illustrates what would be achieved with the drill.