Ok I think I have a fully working WMI kit now! I took the nozzle out the FMIC hose and pressed the test button, working fine.
I fitted the inline filter, hit test, nothing! Removed filter, hit test, nothing! How can this be?!
I removed the whole nozzle/check valve assembly off the hose and tested again, fluid coming out. Added the filter, fluid coming out still. Popped the nozzle back on, fully working! Bloody weird.
I can only imagine that they have tightened this latest nozzle a bit more as I keep complaining they leak. The pump must not be able to crack it open every time!
I'll be keeping a close eye on this little bugger. Might need to do some logging of AITs to be able to tell when it's working or not.
Anyway, I had to destroy the old nozzle as normally AEM ask for the old one back bu as they are in the states they ask the uk customers to smash them up. I took it apart first and got some pics. Enjoy: