I shipped the injectors to another user/contributor on this forum, and he cleaned, rebuilt, and bench tested them for me. I ran almost 2 cans of Diesel Purge through the system prior to replacing the nozzles. I have not drained and refilled the injection pump, but since there's been 5 or 6 tanks of gas run through the car since I did the nozzles I'm not sure what that would accomplish..?