Thermoquad low-speed fuel well not filling?

Thanks a lot for all the great advice, guys!

Around here, high-quality gas like Chevron costs at least $.25 per gallon more than cheap mini-mart gas. I've been buying the cheap stuff (yes, it is E-gas), but I think I'd better open up my wallet and start buying the better gas.

Here's some more background: It's a 6461 S that was rebuilt about a year ago by someone who does a good job. It ran well until recently, and passed its California smog test last year with flying colors and a smooth idle. About a week ago it began idling poorly and, somewhat intermittently, not wanting to start; dying after starting while refusing to re-start; and when it was running fairly decently I wasn't getting any accelerator pump squirt whatsoever, so it sagged worse than granny's breasts when accelerating from a stop .

I doubt that the accelerator pump is bad because it's only a year old, unless California E-gas killed it. Since both the idle ports and the accelerator pump are fed from the idle well, I am suspecting that the idle well is not filling.

The fuel pump does deliver good volume into a jar while cranking (I guess it could still be low on pressure, though). The main jet wells were attached with panel seal at the time of the rebuild and look good. No fuel in the manifold to indicate main well leaks.

So I am thinking that the inlet passage which supplies the idle well is clogged, but I don't know where that passage is located because I'm really not all that smart about TQs. I would like to try cleaning that passage out. Can anyone tell me which passage(s) feed the low-speed circuit? If you need me to post a picture that you can refer to, I would be glad to do so, but I would need you to tell me what to post a picture of.

If that doesn't work, I think I'll send the damned thing out to a carb rebuilder for an autopsy and resurrection, and ask them to be sure to tell me what they find wrong with it. If I do, I will follow up and let you guys know what they say the problem is. In the meantime, I'm using a 6518 S (industrial) TQ that is freshly rebuilt, and the old camper van runs really good with that one. I can't leave it on there, though, because the 6518 has neither the EGR nor the same vacuum ports that the 6461 has, and which are required in order to smog it next year.

Thanks again, everybody!