[Razorback1980]

The best way to clean a tank is to take it out of the car, but these tanks are apparently really a lot of work to get out. I would just disconnect the fuel line and run a hose from there into a tank somewhere so the cleaner would have a place to go after you put it in the tank. I would drain what is in there and then if you can put a cleaner into the tank using some type of air pressure until it comes out as clean as it went in. reconnect lines and refill gas tank with new gas. If I had no means of using air, I would just pour the cleaner in unless what comes out looks real bad, then I might pull the tank. There might be a better way, I'm not familiar with it though.

You don't have any fuel in the lines now so you are already starting with empty lines. After I cleaned the tank, all the fuel lines and the fuel rail, I would put everything back together and then jumper the DME per clarks-garage and that would put fuel pressure up to the fuel rail prior to starting. If you don't do that, the car will just have to crank longer before it starts. If it were mine and it hadn't been started in a long time, I would want it to crank longer so it builds up oil pressure prior to starting.