Thermoquad low-speed fuel well not filling?

The car doesn't want to start; doesn't want to run at all on the low-speed circuit; when it does run it idles poorly; and the accelerator pump doesn't work. Does this sound like bad primary circuit O-rings to you?

The reason I ask is that it seems to me like the low-speed fuel well is not filling at all, and I thought maybe bad O-rings would cause this. The O-rings are about a year old, but we have really wicked gas out here in California.

I've squirted carb cleaner into the low-speed jets and they didn't seem plugged.

What else should I do to diagnose it while I have it apart?