Have a 2004 Focus SE automatic with the Zetec engine. I have been using OBD2 scanner while driving to monitor another problem but I noticed in the last few days that the fuel pressure goes from 39/40 to 55/58psi on the OBD2 scanner. I used two different scanners thinking one had a problem. This happens only occasionally though. There are no codes recorded and car runs great. Just got 33mpg on a 6 hour drive. No stumbling starts fine no gas smell. I have not started digging into it because I don’t want to just throw parts and money at it. Any ideas?