#46 for the fuel rail but how do you detach the round stainless coupling that the fuel line goes to that attaches to the rail? Once you take the clip off you can push it in and it springs back out but I can't get it unhooked. I have the BG Chemical kit for the rail. BG guy said the MOA is loaded with the good oil additives. Thought i might do a BG engine flush just before the rail cleaning or during then change oil, 95,000 on the engine.