Stop chasing leak-free with sealant on wet injector cups

In my experience, sealing a cup with any moisture on it just moves the leak to the next startup, and I've seen three shops redo the same 6.0 job within a month because nobody dried the cups with brake clean first, so has anyone else tracked failures back to a damp surface?

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the_lily15d ago

And I'll tell you what, that's exactly why every leak I've chased down on a 6.0 has traced back to someone rushing the prep. Water sits in that little cup groove and even a tiny bit of brake clean won't get it all if you're not wiping it bone dry with a lint free rag and letting it flash off. I've pulled injectors that were sealed perfectly but the cup still had that telltale rust ring from moisture trapped under the sealant. That's your leak waiting to happen, not the injector, not the cup, just your own impatience. Drying those cups is a 30 second step and skipping it costs you a whole weekend redo. You don't get to blame the parts when you didn't give them a clean dry home.

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