Almost to the magic "10K"....slight fuel issue

Well, not much to report as of late except that I'm less than 1,000 miles from the magic 126,223 miles which will officially make a total driven mileage of 10,000 in a little over six months from acquisition. The car has been unbelievably reliable in that time and the only little niggle to report is a funky fuel tank issue, which I thought I cured with a new three-way solenoid valve, but on the first outing after replacement, the problem persisted. Basically, if I fill both tanks and run the left one down first, then switch to the right one, the unused fuel is returning to the left tank in rather short order. So this problem doesn't leave the car undriveable, but it does make for an annoyance- and having to remember to watch the fuel gauge like a hawk once I've gone into "right tank" mode. Oh well, in this many miles, you can forgive the old girl, right?