Hi,
It could be the injector is worn and causing the issue, but the connection should be able to hold the pressure regardless if the injector is working or not. You may be exactly right. The remanufactured injector may be the issue. Since you did purchase a new return hose and clip, that is the only thing that makes sense at this point. However, as I originally mentioned, I'm not familiar with your specific vehicle and its design.
I have learned that even though it is a VW engine, it's in a different vehicle and things get changed. So, if you have a chance, upload a couple pics so I can identify what you are dealing with. If I see something, I will certainly be happy to let you know.
Take care and please feel free to let me know if you have other questions.
Joe
Wednesday, September 15th, 2021 AT 7:31 PM