The seal on the connector tube is designed to leak, I often see heat marks on the injector bodies from this, the return port is right above the connector tube inlet on the injector body. There is a rifling in the head where the banjo on the rear of the head connects to returning the fuel to the tank. The o-ring on the injector body seperates engine oil from this rifling, and fuel from reaching the valvetrain area.

 

interesting guess I need to take a look inside again thanks.

 

I've noticed sometimes in different ads for injectors where they say if you have a 98.5 and serial number blah blah and lower that you may need different tubes. I'm not sure what's different but somebody must know something?