Well so much for that. The morning after... same, basic trouble.
When she's got fuel, she runs smoothly. But with no load, she hunts every now and then. It seems clear that the cause is fuel supply.
I added the A/C load and... same thing. She took on the load, but surges every 10 seconds or so. I watched the fuel filter and it looks like the same thing. When she's surging, you can see the gas pour in. But when she goes back to smooth... the fuel seems to stop... and... if I recall correctly... even bubble backwards... as the filter is still only about a third full.
I have not run down all the lines, but I'm guessing they are steel. So the likelihood of an issue there, I believe, is low. And there don't appear to be any kinks between the filter and the steel, which is only about a foot-worth of rubber hose.
Pump seems the most likely candidate at this point.
