#1 delivery valve was loose. It became untightened while I was fidgeting with the hard line.

1. Keep those spline locks tight! If one's missing, replace it.
2. It's always the simple things.

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.