Does anybody know what that fuel pressure regulator hose is for as it goes to the airbox which means thereís no vacuum there so Iím a little puzzled as to what its purpose is and how/when it comes into operation. Trying to diagnose a very rich running condition with lots of gray smoke and black sooty water out the exhaust. Car starts fine and then stumbles and smokes like crazy. I recently checked coldstart valve which is fine not leaking injectors are all brand new no vacuum leaks Iím suspecting high fuel pressure possibly clogged return line. I need to order a fuel pressure tester to determine that And thought possibly an issue with that fuel pressure regulator.
Thanks as always for your thoughts. Jim
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