Injector return lines, injectors - Diesel Forum - TheDieselStop.com
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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 08-03-2011, 05:37 PM   #1 (permalink)
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Injector return lines, injectors

I have a leak on one of the injector return line T's. I replaced the line but it is still leaking. Seems like a lot of slack on the return T's. I'll be installing a return line kit but am wondering about the injectors. No problems right now but I have no idea how many miles are on this engine.

Better to have the injectors rebuilt? Build a pop-tester and only rebuild the weak ones? Learn how to rebuild them myself?

Also, I read that the return lines on the 6.9 are 3/16". Mine are 1/4". My truck is an '85 model. Does this sound right?
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Old 08-04-2011, 10:15 AM   #2 (permalink)
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As long as the barbs fit the hose and seal, the injector orings are basically the same size IIRC.. Hose ID was probably due to turbo fuel return flow requirements.
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