DEF pump sound getting louder

[snailexpress]

(03-27-2018 )rrod Wrote:  

(03-26-2018 )snailexpress Wrote:  DEF and DPF are OEM parts. Could be different unit on Volvo or Freightliner or Pete or no DEF/DPF unit at all. This is why it's not in Quikserve.
Check the DEF dosing nozzle. If you have Insite run the test for DEF injector. If nozzle is plugged air will not come or restricted to in DEF line.

Good idea . It would be the first real use for my Insite.
Question: in the case I would remove the dosing nozzle(valve) to clean it , Quickserve appears to suggest that the gasket have to be discarded ? That means I have to get a new gasket before this ?

Gasket and white heat protection ring. Don't remember for sure but think it is in the kit.