When I say loosen, just crack the lines. Also, I'd take care of the orings that are leaking on the injectors, you will start sucking air and make it harder to start.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k