When we got the fastback, I worked on it until I got it to run. It was showing that it didn't have much gas in it, so I put a few gallons into it at a time, drove the car up and down my street and sometimes around a couple of blocks in the subdivision. Eventually, the stale smell went away as the new gas absorbed the old.
Not knowing the condition of the tank, we eventually found that the inside was in horrible condition and the superfine rust actually passed through the strainer and filter and plugged up the inlet of several injectors. That led to the replacement of the injectors, pump, sending unit and tank.
