Fuzion 428 Exhaust Issue

TheManTheLegend

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Joined
Jan 6, 2025
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Location
Conroe
First time RV this year. Non-full time. 5th Wheel Fuzion 428 model. Pretty new to campers/RVs but learning what I can as I go.

Anyone have a mapping of where various under belly appliances are? (I.e Water pump, specific placement of various tanks, heater/furnace etc). Looked at books seller gave, all the Fuzion stuff but not terribly helpful on ‘where’ this stuff actually is or how it plumbed. Anything would be helpful.

Also, we used this RV for a week during Hurricane Beryl and was great, no issues, but went to run it today and noticed black soot around the exhaust port (presumed it’s for the furnace) and had strange smell to it as well. Kinda made me bit light headed so ended up shutting it off.

It’s plugged into house 50A. Furnace running on gas we got with it. Hadn’t run out so using what it came with.
 

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Possible bad propane?
Malfunction in the burning system of the furnace not completely combusting?
Definitely something that should not be delayed upon and addressed and fixed immediately.
 
Welcome to the forum :wlcm:

You won’t find any schematics from the factory. If you have access to compressed air, blow out the furnace exhaust and try again. If it doesn’t get better then your probably looking at taking it out and apart.
 
This could of been caused by a blockage in the exhaust by mud daubers, mice, or some other animal nesting. It could also have been a case of sliders building a nest in the burner tube. The furnace will need to be removed and cleaned/serviced. This will require disconnecting some wires and the gas line. I don't know your skill level with these disciplins. IMO it's not a project that someone without experience in the discipline of lp gas and electrical knowledge should attempt.
 
Carbon buildup in the exhaust is from incomplete combustion. The most common cause of that is inadequate air intake to the combustion chamber.

You said that your trailer is "parked next to your house" was last used during Beryl (late June/early July) and now (January) 6 months later, the furnace is smoking.

I'd suspect (as others have already posted) your problem is likely a dirt dauber nest buildup, spider web buildup, wasp nest buildup or even a mouse "hiding seeds" in the exhaust as your most likely cause for the smoking.

As for a "generalized diagram of where things are located"... No such animal exists for a specific floorplan unless an owner has taken things apart and drawn their own diagram. Neither the factory nor any "down range" organization provides such diagrams for any Keystone product.
 
They sell wire covers for the exhaust to prevent bugs from nesting. You may want to consider one once you solve the current issues. They are cheap.
 
They sell wire covers for the exhaust to prevent bugs from nesting. You may want to consider one once you solve the current issues. They are cheap.

All the RV furnace manufacturers recommend against such wire covers. If someone does install one, be sure to remove it before taking the trailer in for any "furnace warranty problems"... Many dealerships will ignore such screens, other dealerships, looking to maximize profits will report the screen, cancel the warranty or say it's been denied, and then "upcharge the repairs at shop labor rates.... All RV appliance manufacturers use a "reduced repair charge reimbursement" so it's in the dealership's interest to charge a customer "full rate for labor" if they are so inclined....

So, if you use a wire screen, and your dealer is "not the best around", protect yourself from being upcharged.
 
That type of vent is both an exhaust (inner ring) and fresh air intake (outer ring), and yes the screen will provide enough restriction to potentially affect performance. Whether real or not, it is enough of a “modification” that a dealer or manufacturer can use it as an excuse to deny a warranty claim
 

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