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Yes, I bled the s..t out of the pump and laterly the GOK. I did purge some air from it but the fuel after drip persisted. I had fuel drip and moisture behind the brass air deflector washer thats behind the nozzle too (std on the Worcester 12/18). That old post from 2004 I re-posted previous...

Thanks for all your replies. Removing the GOK has done the trick..fuel fumes now gone.

Stripped the burner apart last night again, the staining was all around the nozzle/nozzle holder and blast tube, suspected a cracked feed pipe but no stock locally, took the nozzle out and remembered I's sealed the thread with ptfe, took that off cleaned up the nozzle and put reassembled with...

Thanks, The tank bottom is approx level with burner.. I think I'll try it without the burner. I did get a slug of air from the pressure test port extension which I guess would have caused the compression or hydraulicing effect.. trying it again for an hour or so..

What the thoughts on de-aireators? get rid?? and fit a filter in its place...?

Been reading about afterdrip, seems trapped air may cause this and one post I uncovered suggested a dual line de-aireated system will suffer indefinately!? https://forum.heatinghelp.com/discussion/76736/after-drip-question I have a dual line feed and return from the burner to the GOK...

I know its been a while but we've had a hot summer and no boiler use.. Filled the tank and had a weep at a union prior to the de-aireator which was without the pump running. Cured that and decide to fit a pressure regulator before to offload any excess pressure from the full tank, 1800ltr...

Replaced the pump, more cost effective in the long run. fuel still ejects from the nozzle on shutdown, a jet for a second or so, not a dribble.. see what its like tomorrow.

Thanks for your reply, I ran it outside and there is 50v at the coil on startup, ignition is immediate with no priming, but on shutdown, flame out occurs without any dripping from the nozzle for a second or two, then a jet of oil is ejected from the nozzle for around 2 seconds, I dont know what...

Well, title self explanatory really. I checked the balanced flue sealing, the heat exch.s are clear aside a little soot. Gaskets both good. I pulled the burner (foam gasket good) and there was a little evidence of burnt oil down the face of the nozzle and around the upstream side of the burner...