I'm losing a lot of fuel around the 4th and 5th injector on my 1985 300D, it drips all over the engine.. because the braided fuel line is starting to wear out--(unless anyone has an alternative idea..) But when I go to order the hose off of shop Forum, they list 2.5 mm, 3mm, 3.3 and 4mm sizes, which kind of confuses me..
The Fuel was spurting like crazy yesteday and my engine was knocking like all h__ and I pulled over and used aUtility Knife and took an extra piece off a lengthy run, but I would like to fix this once and for all.

Finally I would like to find out once and for all why the injectors leak.