I just ran a can of LM diesel purge thru the 240D and what a difference. Nailing stopped and the engine sounded great.

When I put the fuel lines back on for a test spin, the nailing returned.

Any thoughts?

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79 240D (no name yet) 203K Miles Maple Yellow
98 2500 4x4 HD Dodge 24 Valve Cummins TD
83 Chevy Van (Dead-Trans. shot)