I did run diesel purge through the valves and injectors but that was before I had the time to clean the tank screen. I was going to repeat it after cleaning the screen because after 15 minutes of running the purge the fluid circulating was totally black. I just bought the car and going through fluids and filters renewal for a good start. I also degunk the engine and put the Liqui Moly oil that comes with Molybdenum.
I will do what you suggest today. Thanks.