DEF contamination??

[lmorris]

Have one here with very low reductant pressure. Pulled out the tank and had a look inside and found a white sticky substance(how long till the comments add up on that one... ). Almost looks like liquid teflon thread sealer. I don't think its normal. Getting sample sent out for testing maybe. Anyone seen, or know of what might cause this kind of reaction with DEF?

 

Update: Whatever is in the tank seems to be reacting with the crystals left behind when the fluid evaporates. It seems to be on the sides of the tank only and not in the actual fluid. The customer had AIR1 DEF put in at last oil change. He is getting the fluid from the shop that has the AIR1, and the fluid in his tank tested along with the white greasy substance. He says he will let us know the results.

 

Update: no-one will test this stuff for us. Replacing tank assembly and leaving it up to the service manager as far as who pays.

 

Have another truck in with 0 PSI reductant tank pressure. Here we go again.

 

Update: The second truck's reductant tank is clean and has no contamination. It received a new pump.

 

So far no-one will test our DEF samples. We are assuming this substance was in the tank from the factory, possibly during tank assembly on the big seal at the top.