Old Faithful -- Not Now, Won't Start

[Stocker]

Truck drove OK a couple weeks ago. Had to crank a lot to start it but that's been happening after sitting several days. Once it fires up it's been running fine.

Tried to start yesterday, no go. Cranked strong but wouldn't catch unless I gave it a shot of starting fluid. Then it fired momentarily, then died. Okay, no gas....

Looked at it this morning, tanks are not full but seem to have more than enough. Disco'd the hard line at the carb, dry as expected, hooked up the pressure gauge and hit the key. Jumps up to ~6 psi, should be good, but still no fuel.

With good pressure, I'm assuming the fuel pump works. Is it possible to build pressure without pumping fuel? I replaced the under-cab filter recently and have driven the truck since then, so it should be good. All my tanks are locked and I see no sign of forced entry, and the gauge shows fuel and I also staked two of the tanks. Pretty sure there's enough gas, just not getting any to the carb.

Now I'm stumped. What am I missing here? Thanks for any help....