Hi Folks
i just want to ask a tiny silly question

I have a 1991 190 2.5 with the legendary OM602 NA engine

is it normal for the diesel injector return end cap to fail after 3-5 months of use ?
because i m tired of replacing it too often and the mess i have now diesel fuel all over the place . i even made i custom one myself with i heavy duty braided return hose and pluged it with a screw and it work fin for a wile but it fails last day after 4 months
i know the end cap are very cheap but failing too fast like that makes me worried because a friend also have a 1992 190D 2.5 NA om602 he bought it 2 years ago and he never changed that cap ever

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1991 190D 2.5 515K