New tank installed. Got a complete tank with sending unit and fuel pump for $50, in much better shape rust-wise that my old one. When I was cleaning the old one, I saw suspicious bubbles around the lock rings when I had a fan running for ventilation, so I'm pretty sure even replacing the vapor valve stuff wouldn't have quite solved the leak/fumes problem.
As of now, it's got only the third complete fill-up I've ever done, and the only one that's stayed in the car for any length of time. No leaks, no fumes. And when I was refilling the tank a dribble at a time, the gas gauge gave totally plausible readings.
The guy who sold me the tank also sold me a driver's side fender liner. Most of the rust problems in this car, I think, are due to this being missing. It's a little late, but at least it will help slow down the decay, and protect what fixes I do make. Like the horn fix:
I think one of the horns fell out of the car during previous work, and I didn't even recognize what it was. With new high and low horns, everything is properly loud again.
The list of serious annoyances is getting shorter:
- transmission rebuild and squeak diagnosis
- rear shocks and springs, to match the front
- smog system fixes (codes 44/94, disconnected hose)
- re-adjust or otherwise deal with the rear brakes
- figure out what to do with the battery hold-down
That brings me closer to stage 2 of this rebuild: figuring out what to do about the structural rust. I've had some people make suggestions, but no one who knows what they're doing has actually seen the problems yet. It seems like the worst-case scenario will be to cut off the whole front clip and weld in a new one from a donor. Someone knows a guy who can do the job for around $800 labor; that's to pull everything out of the engine bay, do the cut-n-weld, and put everything back. Cost for the donor clip looks to be about $150 or so. Welding in patches to the current clip may not be all that less expensive, so I'm considering it anyway. But I've got some more talking to do, and at some point I need to show some people what the rust looks like to get some non-speculative answers.