Someone got me/My truck good!
My tow vehicle has been going through DEF pump assemblies and Ford couldn't figure out why. The pump had been replaced twice and while we were towing the Excel home from the dealer, it threw the DTC f...
Forum Discussion
transamz9 wrote:
I see your truck is a few years old. Is there a possibility that you have air getting into the tank? I do know that DEF will crystallize if exposed to air for long periods. Does your truck sit for long periods with the DEF tank low?
I'm just trying to think of other possibilities because it seem you would have noticed a foreign substance around the filler. Heck, I can barely pour the DEF in with a spout on the can without spilling a little. It would be hard to put a substance like sugar or something in that little hole without spilling some.
The last time I filled it, was in October. There was no foreign substance present then. Also, when I looked inside the tank, there was no evidence of air causing the problem. What was on top, was milky and thick. The truck also doesn't sit. I also tend to fill it, when it's only a gallon low. I usually don't get more than a gallon in it, when I fill it.
