Dooder - Is this an Oasis system?? If so, when you say that you replaced the fuel filter are you talking about the large spin on filter or the small filter in the nozzle? The reason is if you didn't prime the fuel filter with fuel that's what's going to happen, sputtering and black smoke until all the air is out of the system. If you think you have a more serious issue look at the front of the boiler and see if there is a fault light.
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Charlie, Jackie
w/Lucy the Dog & Jack the Cat
2008 Newmar Mountain Aire 4529
NHSO
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