Low mileage 2011 f750 Cummins 6.7

[Skizzlez]

Hey guys, been a bit since I've been on here, but have a question regarding code p3574 - at least I think that's it off the top of my head..

Been driving the truck a bit here and there since the Cummins shop replaced the scr. Changed the doser with a genuine Cummins unit. But still had the low def pressure periodically. Eventually it would derate and shut me down. I ran the aftertreatment test numerous times, it always passes first try, no leaks. Gets to 130psi and holds it. Does take about 20 to 25 seconds to build that pressure, but it makes it..

The other day I ordered a replacement def pump, because I can't see anything else in line that would cause they low pressure code.. it's just the lines, pump and doser. Swapped the pump tonight, and will test drive Tuesday. Ram the leak test, same deal, seems to pass just fine.

Also, popped the old one apart. Looks brand new inside.

Jasom