hi guys
hope somebody can throw some light on my problem,i recently had to replace my engine a4 avant 2.5 tdi had a few teething problems just got on a final one which I am not sure about,the issue is I cant stop the leaking of diesel at the final injector return banjo I have replaced the washers on the banjo and also the flexi pipes,so I removed the pipe from the check valve and tried to blow into the check valve at the inlet side but could not then I removed the pipe from the other check valve on the opposite side of the engine and found that I could blow down it so not sure after reading other threads which is correct hope somebody can help please