[JMWhite]

Does anyone know anything about clearing a blockage in the def flow? I think i may have a small blockage. (hose/tank anything before the metering valve)

[RDA3440]

If the metering valve gets caked up, it can cause flow issues and build up in the line to the metering valve.

Recommend inspecting the metering valve first, clearing any blockage there, and then testing. Sometimes clearing flow at the valve will promote flow, and when DEF gets pushed through the line it may dissolve some of the crystallisation in the line. If it's too blocked up you might need to replace the line.

[Yozh]

Guys, wouldn't you agree that DEF is very much water soluble. I would think that even if the whole urea tank would be one solid brick of crystallized urea, one can wash it out with water and be good. However, if that crystallized urea has caused any of the damage such as failed temperature sensors, then it's a different story. But even then, there are some work arounds. My point is, there is no need to replace components simply because of crystallization.

[RDA3440]

Originally Posted by Yozh

Guys, wouldn't you agree that DEF is very much water soluble. I would think that even if the whole urea tank would be one solid brick of crystallized urea, one can wash it out with water and be good. However, if that crystallized urea has caused any of the damage such as failed temperature sensors, then it's a different story. But even then, there are some work arounds. My point is, there is no need to replace components simply because of crystallization.

Yozh is right - my way is the environmentally irresponsible fast clean hands way; I've been spoiling myself too much lately. Way to call me out (in a good way). LOL

I was never like that with my TDI Golf. I don't know what happened... LOL!!

[Yozh]

Not really calling out. JMWhite is fairly new to this board and I'm sure it's a frustrating thing for him to have so many codes. Just trying to help him so he does not think that now he has to start throwing parts at the car where there are alternatives exist.

[RollingCoal]

Must use distilled water though.

[JMWhite]

Ok, thanks guys I Completely agree with you guys! I think it very well could be the line or something in the track of def flow is that stuff easy to get to? I am going to look again... And get some water!

[RollingCoal]

Originally Posted by JMWhite

Ok, thanks guys I Completely agree with you guys! I think it very well could be the line or something in the track of def flow is that stuff easy to get to? I am going to look again... And get some water!

It's not too bad to get to.

Word of warning.....wear eye protection. Urea is not kind to the eyes.

[JMWhite]

ok found everything! Pump comes out of its housing easy! I still have it with its hose on, So my plan is to unplug the hose coming from the tank to the hose, see if it drips, if it doesn't the problem is the tank (right?) then if it drips then I unplug after the right after pump then turn the car on... briefly with a dry catch can if there is fluid it is the line to the scr or the scr... Thoughts before I do this thang??? I plan on doing it at 8 am if you don't answer quickly!

[JMWhite]

question 2 the active and passive tanks... (it doesn't matter which you put Def in right all I know is one is much smaller than the other!) If I have even over flowed the smaller one would I be having these issues? Don't know if I have It would have been a long time ago if i did.

[RollingCoal]

Originally Posted by JMWhite

ok found everything! Pump comes out of its housing easy! I still have it with its hose on, So my plan is to unplug the hose coming from the tank to the hose, see if it drips, if it doesn't the problem is the tank (right?) then if it drips then I unplug after the right after pump then turn the car on... briefly with a dry catch can if there is fluid it is the line to the scr or the scr... Thoughts before I do this thang??? I plan on doing it at 8 am if you don't answer quickly!

1) disconnect hose from tank to verify flow
2) disconnect hose between pump and scr meter on both ends and verify flow
3) very pump operation

If everything operates normal, verify the metering valve sprays. If not, soak it in warm distilled water.

[JMWhite]

Does the vehicle have to be on to ensure the pump works?

[JMWhite]

oh!!! you saying if there is fluid right now between the scr meter and pump then the pump works. so I dont have to run pump.

[JMWhite]

Dang u got me asking questions to myself right now! So I am under the car behind the driver rear wheel... There is a pump (assuming it is for the scr/def) there is a hose going into the "IN" side of the pump This hose has a junction with another hose that looks to have a cap on it (probably removable to check flow of the tank side?) I don't know how to remove that cap if I need to (does it just pull off or is there a trick to it I don't want to break it) Then there is a hose on the outgoing side of the pump. I assume i would unplug that hose from the pump and run the car momentarily to see if the pump works and pumps DEF? If it does I plug the hose back on disconnect it from the scr meter and run it again ensuring the hose is clear then put the hose back on the scr meter disconnect scr from the egr run it again to ensure it is spraying? Does that sound right. I am trying to get it I promise I have helped me immensely to this point please don't lose patience!!!

[JMWhite]

ok i feel dumb it was just a button!

[RollingCoal]

http://www.e90post.com/forums/showpo...4&postcount=61

See picture & attached pdf....originally posted by mik325tds

[JMWhite]

Got it that is the cap to the tube that goes from the tank to the filter, I took that cap off and no drip... but I see the flow theory though, that tube (which should flow with out power just by uncapping right?) throught the filter to top of the pump out the bottom of the pump and to the scr metering valve. See I am learning (I look stupid if I am wrong right now pm me if I look stupid haha)! Again i uncapped the tube that is draining in that link and nothing came out however it did drip like twice but not flowing (am I maybe empty or is it something in the tank or am i doing something wrong?)

[RollingCoal]

You may be empty. Don't leave anything disconnect, or the urea will crystallize quickly. You might try flushing the tank with a couple gallons of distilled water, but wait to see what others say first.

Personally, I would try adding def first to see if it runs out the hose.

Do you hear the transfer pump running when you shut the car off after long drives?

[JMWhite]

Everything is closed right up!

I will add a little tomorrow morning and check if it runs out.

I never listened for it (tranfer pump is that the pump by the filter behind the driver rear tire?)

On a side note it wont go for 1/4 mile without the engine mal light coming on! and I will reset... it now come right back on. I don't want to take it on any long rides until I figure this stuff out. But I will try it if I have to!

[JMWhite]

Also the warning never came on if it is empty...

[Yozh]

Originally Posted by JMWhite

Got it that is the cap to the tube that goes from the tank to the filter, I took that cap off and no drip... but I see the flow theory though, that tube (which should flow with out power just by uncapping right?) throught the filter to top of the pump out the bottom of the pump and to the scr metering valve. See I am learning (I look stupid if I am wrong right now pm me if I look stupid haha)! Again i uncapped the tube that is draining in that link and nothing came out however it did drip like twice but not flowing (am I maybe empty or is it something in the tank or am i doing something wrong?)

You guys are confusing a transfer pump with a delivery pump. As I understand, you are trying to see if there is a blockage in a metering line that one goes from the delivery pump to the metering module (DEF nozzle) that is attached after the DPF.

Here are a few tidbits that may be helpful to you:

[mefferso]

Great breakdown, whats the website you found these at?

Originally Posted by Yozh

Attachment 1448549
Attachment 1448550