Hello guys, need your help regarding our aux boiler burner. Saacke SKVJM36. When i open the burner, fuel is all over the place. There was no leak from the pipe, some fuel are coming back to the primary air fan. But burner is working in normal condition. Can be started easily in automatic and emergency mode. Belt is good, current of motor is okay. I tried to adjust the primary air to give more air and reduce fuel pressure but still some fuel are still going back to the impeller of primary air. Did this happen to anyone?