What SD Blue said. Every time I think an injector is leaking, it turns out to be the return line. Last time I balanced the injectors, I tore one back out because I thought I had a leak. The return line was only a couple of months old, but that was the culprit. I replaced the line, and then it happened again in another few months.

For some reason, new line is just not lasting very long on my engine.

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"