Just a few days later....
I'm offering a warning that some of you are already aware of:
These machines are talking to each other.
I know this because not 7 days after I replace a fuel pump on the '66 Suburban... the same part on the same style engine (now in a '69 c20) seems to have also gone bad.
Let's hope I can use all I learned on Project #1.
Usually these events are so far apart in time that you forget what you did 'last time this happened.'