My injector return cap is leaking. Can the little brass plug in my OE cap be taken out and pressed into a short section of the hose?

Would a leaking return line cause injector noise? I can’t really see how, but it seems like it may be one option as culprit for my ticking sound. The return is leaking.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)