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My apologies in the delay. I moved the rubber piece down and have been keeping an eye on it after every trip and so far no buildup outside of the cap or laying in the area around the gas cap so so far so good.

Thanks again!
Awesome! I'm glad to hear that my situation/experience was able to help out a fellow colorado driver. This forum is a powerful tool when used properly, have found much useful information already as there are some very knowledgeable and helpful people participating.:nerd:
 
Take a look at the earlier posts in this thread and you'll see my pics and explanation of the 'rubber piece' :wink2:
Theres only the one pic in this thread which I quoted, lol And I'm not seeing any rubber piece. Maybe it's cause everything is black and I'm not distinguishing anything from plastic? :serious:


Prolly have to go out an look at it.
 
I didn't see any rubber piece inside the cap. And since DEF is predominantly water, the buildup of dried fluid hasn't been a big deal to me.
 
So I checked out my stuff and I don't see anything different that you pictured

Image


and nothing pictured above is rubber or rubbery

inside the cap

you can see the flimsy little white cap liner that appears to be the "seal"...like I said before it's an even crappier version of a soda bottle cap seal. the indentation ring is apparently where it sealed before or is supposed to seal but there was a lot of moisture on the lid today when I took these and I just filled it last Friday.

Image



If y'all have a rubber seal please post pics because I see nothing.

Also when I tightened the cap this time tightened by the handle and then thought to tighten from the base too and sure enough I was able to tighten about 1/8th turn more after the handle started clicking. I'm wondering if the "clicks" are too soft and not allowing the cap to fully tighten, thus the seal not making good contact with the end of the fill tube???

If the moisture/crystals continue I may cut a circle out of viton and fit into the cap to take up space and make a tighter seal on the end of the tube.
 
Just the rubber membrane covering the whole inside of the fillup area around the 2 spouts... note: fixing this membrane did nothing to prevent the build up of dried def in the treads of the Def cap; my situation was much more drastic than this as the whole side of the truck was covered in def fluid before fixing the membrane. The cap Iqdchkn pictured is identical to mine and agree that the cap seal is junk. Hope this clears up my previous posts for ya's :)
 
Just the rubber membrane covering the whole inside of the fillup area around the 2 spouts... note: fixing this membrane did nothing to prevent the build up of dried def in the treads of the Def cap; my situation was much more drastic than this as the whole side of the truck was covered in def fluid before fixing the membrane. The cap Iqdchkn pictured is identical to mine and agree that the cap seal is junk. Hope this clears up my previous posts for ya's :)
Ahhhh ok gotcha, I thought you had something that solved the issue.

Try turning the cap at the base (the area behind the tether ring) and see if it gets any tighter than the handle clicks let it get.
 
Discussion starter · #30 ·
Ahhhh ok gotcha, I thought you had something that solved the issue.

Try turning the cap at the base (the area behind the tether ring) and see if it gets any tighter than the handle clicks let it get.
We moved the entire rubber piece that sits around both caps to ensure that the def cap was actually fully threading and locking into place. In my experience, there was some outflow that cause crystal build up around the neck of the def fill line. By moving the rubber molding down it appears, for the time being, that this has solved my problem.
 
We moved the entire rubber piece that sits around both caps to ensure that the def cap was actually fully threading and locking into place. In my experience, there was some outflow that cause crystal build up around the neck of the def fill line. By moving the rubber molding down it appears, for the time being, that this has solved my problem.
less words, more pictures. :nerd:
 
I had to fill mine Friday evening since I was going to be about of town for the weekend and this is what mine looked like this time. Which is IMO not what I expect but still better than it was the first time I filled up.

The white "seal" at the base of the cap seems thin and permanently stamped with where the tube made initial contact with it and unable to really seal well. It literally reminds me of the crappy thin seal in the top of a plastic soda bottle lid.
Totally agree, it is a part that was cheaped out on unfortunately... be nice to find a chemical safe insert replacement for the cap; the bit that makes it past the seal and into the cap threads make it a pain to remove.
This is better than my first problem, which was the side of the truck covered in def fluid 5or6 times before I spotted the rubber problem.
I found a rubber washer at ace hardware that I had to trim the outside edge slightly to get it to fit tightly inside the cap. It measures 1 1/4 x 1/16 thick. I had to trim it to around 1 1/8 on the od.

Here's a link to the actual gasket.

http://www.acehardware.com//product/index.jsp?productId=58639526

I added a gallon and a half while on a trip, and had no problem with leakage, but when I had my first oil change done at the dealer, they added a jug(which they claimed was the most they could add as part of the free oil change), and it leaked down the side of the truck ever since. So after a few days of trying to remove and reinstall the cap to get it to seal correctly, I decided to try this.

I looked online at the MSDS sheets to see if the rubber would deteriorate or react to the DEF fluid, but didn't find anything. I've had it in there for a couple days now and haven't had a leak yet.
 

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I found a rubber washer at ace hardware that I had to trim the outside edge slightly to get it to fit tightly inside the cap. It measures 1 1/4 x 1/16 thick. I had to trim it to around 1 1/8 on the od.

Here's a link to the actual gasket.

Danco 1-1/4in x 3/8in x1/16in Flat Washer (61807B) - Flat Washers - Ace Hardware

I added a gallon and a half while on a trip, and had no problem with leakage, but when I had my first oil change done at the dealer, they added a jug(which they claimed was the most they could add as part of the free oil change), and it leaked down the side of the truck ever since. So after a few days of trying to remove and reinstall the cap to get it to seal correctly, I decided to try this.

I looked online at the MSDS sheets to see if the rubber would deteriorate or react to the DEF fluid, but didn't find anything. I've had it in there for a couple days now and haven't had a leak yet.
Cool.

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It looks like there are marks around the edges from where the end of the fill tube is making a good tight fit against the rubber.

I double checked that rubber "Neoprene Rubber" against a reaction chart online for Urea (the main active ingredient in DEF) and it had an "Excellent" resistance rating.

This may be the way to go.
 
Nice. Will pick up a neoprene washer at my local HD.
 
I found a rubber washer at ace hardware that I had to trim the outside edge slightly to get it to fit tightly inside the cap. It measures 1 1/4 x 1/16 thick. I had to trim it to around 1 1/8 on the od.

Here's a link to the actual gasket.

Danco 1-1/4in x 3/8in x1/16in Flat Washer (61807B) - Flat Washers - Ace Hardware

I added a gallon and a half while on a trip, and had no problem with leakage, but when I had my first oil change done at the dealer, they added a jug(which they claimed was the most they could add as part of the free oil change), and it leaked down the side of the truck ever since. So after a few days of trying to remove and reinstall the cap to get it to seal correctly, I decided to try this.

I looked online at the MSDS sheets to see if the rubber would deteriorate or react to the DEF fluid, but didn't find anything. I've had it in there for a couple days now and haven't had a leak yet.
Great info and great help, will do the same and thanks.
 
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