Changed fuel filters with engine warm.

Added a couple of ounces of Power Service to screw on filter - a couple dozen pumps to prime - started at first bump of starter and away we go.

I did not pour fuel from old filter into new because I was concerned that impurities from old (no idea how old) would get needlessly dumped into new.

Tomorrow will be AT fluid and filter change.

Oh, is a bubble of air common in pre-filter?