The CPS is the cam position sensor it is located on the front of the engine on the passengers side in the front. You need a 10mm and a flat screwdriver to change it they cost about $20. I do not know of any other filter than the one behind the injection pump. As for your fuel, I think what you are doing sounds fine, I have logged over 200,000 miles on home made fuel. I have been making my own long before most people jumped on to the home made fuel band wagon. That is I have been making my own fuel for about 10 years, I make it 100gal at a time and use 55gal used oil, 12 gas, and 33 diesel and it works. Regardless what others say it works and my trucks have always ran good on it as well as my D-8 bulldozer, combine, and three tractors. So if you add up all of the thousands of gallons in the farm equipment and the 200,000 miles in the powerstroke I would say it is your truck and if you have a formula that works for you then do it. I for one have no problems in the summer or when the weather gets down in the teens the fuel always works.
