Drained and replaced the old gas that was making my E30 run poorly. Unfortunately it turned out to be a much more difficult process than I expected, and didn't end all that well.
So anyway, my friend and I went to buy a gas can and pump to pump the tank out. Turns out the gas tank is far enough away from the filler that the hose wouldn't reach. So we pulled the back seat, opened the access panel, and pulled the fuel level sender out of the middle of the fuel pump so that we could get the hose into the tank. My friend is actually the one who jumped in and pulled the sender, which will become important later. So we pumped out the tank and left everything open to air out.
A few hours later, I go to reinstall the sender and see that there are four nuts and four washers that hold it on to four studs sticking up from the fuel pump. I look at the sender and see that on the bottom of the screw holes, there are countersunk areas that look just the right size for the washers. So I put the washers on the studs, slide the sender on, and bolt it down. I put the gallon of fresh gas we'd picked up in the tank and drive it to the gas station to fill it up.
I get to the gas station, put the nozzle in the car, and walk away while it's pumping to wash the windows. The pump clicks off and when I walk around the car, I see a big puddle of fuel. Pull the access panel lid and it's soaked with gas. I call my friend, talk to him for a minute, and he says "wait, the washers were ON TOP of the sender!" Fortunately I'd brought my tools in expectation of just such an eventuality and start pulling everything apart once I've dried it up. Get the nuts and washers into the right position, start to tighten them down, and one of the studs snaps right off with the nut as I turn the ratchet!
So I tightened the rest down carefully, let the car air out and drain for a while, and very carefully limped it home. It seemed to do OK, but tomorrow it's going straight to the shop to have them deal with the broken stud. (Which may require a new fuel pump to fix...)
The good news is the car runs MUCH better on the fresh gas. Hopefully I'll have it up and running in a few more days.