I did a little work on the sticking CSV mentioned previously. I put some WD40 in and let it soak, with occasional lightly rapping it and adding a little more WD40. Today I took the stuck injector and gave it a series of 12v and lightly tapping it. It freed up and now seems to be working again.
I found there are filters inside the fuel hose neck on them. It took a little while to get them out without damage. You can see the reddish residue from old gas on the filter and inside the neck of the CSV.
I used a windshield chip repair syringe and some tubing to connect to the valves inlet. I put pressure on it, applied 12v, and then the air hissed out, so they do flow a bit. After some cleaning and flushing they should be good.
