Full black water holding tank

75 to 100 gallons

https://www.google.com/search?q=gallons+of+fresh+water+does+my+1995+wilderness+travel+trailer

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Keep checking the oil level and the transmission fluid level to make sure they stay full, but there should be no oil in the gas tank.
There may be water, however, and it may be brown like oil.
Water will sit in the bottom of the tank and make rust underneath the gasoline, since gasoline floats on water.

what do you mean by unclog? If you mean when you open the dump valve and nothing comes out but you know the tank is full then I suggest this hydroflush. It works pretty well for cleaning out the tank even if it isn't clogged as long as you don't have too many bends or fittings between the drain cap and the valve.

https://amzn.com/B0002UHVAA

Check under the bed. Not sure on your make and model, but that is where mine is in my Jayco.

Pull bottom plug out of hot water heater tank let all water drain. Then open all water tank drain valves and be sure your RV is tilted so it will drain towards the valve. Go in RV access water heater valves put it in bypass so no antifreeze can enter water heater tank. Pump RV antifreeze with hose provided into all water lines throughout RV by turning on your main water pump after you have stuck the bypass hose in a new and full antifreeze bottle, then flush toilet until red antifreeze comes out. Open all faucets one at a time until red antifreeze comes out. I use 3 gal but some only use one, the more the better it’s cheap at Walmart. Don’t forget to run outside shower until red antifreeze comes out also, very important or it will crack in the cold. Finally make sure black and grey tanks are empty and flushed at your last camp trip before winterizing. Pour antifreeze in toilet and all drains making sure first that black and grey tank shut off valves are pushed in and closed. Get a quality cover and store RV, it makes a huge difference on protecting roof and roofs lap sealant! All RV antifreeze is non toxic and you just drain it all at your first camp stop after winter! Note: don’t forget to put water heater ionizer drain plug back in wrapped with new white Teflon tape and take water heater valves out of bypass! Draw a diagram of regular mode and winter bypass mode so you don’t forget especially hot and cold water heater blender valve between the two MUST be shut off after you unwinterize
or you will cool your hot water unwanted and have no hot water to use! Happy Camping folks!

You THINK? If it was bused you would know. Water would be leaking into the interior or pouring out underneath.

Just purchased a Idylis model 0484756 and it has no
operators manuel. Is there one available?
Where?
Thanks

Have you emplied the water tank? There is a float switch that turns the unit off when the water tank is full of water.
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Its A Sure Sign That One Of Your Evap Fuel Lines Could Be Clogged.