Download video: Opel (Vauxal) Vectra 2.2 starting problem. Injector seals change.
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First we changed the fuel return pipes, inspected the fuel filter container for leaks and now we are onto the seals of the injectors, though we didn't trace oil in the fuel filter as that is a clear sign of injector seals failure. I also traced a leak on the tap of the injection pump, which I solved by removing the 4 screws and added some silicone where I considered to be necessary.
After doing all this, the fuel system seems to maintain the fuel itself better in the pipes but still is not like an out o the factory start.