Fuel scrubbing?

[ralley]

Been working on the 350LE. Now that the fuel gage works, I find that I have almost a full tank of gas, which has been sitting for 6-7 YEARS. Why it has been parked for that long is, well, a long story. I have several questions--

Can anyone tell me the gas tank capacity? I cannot remember.

Do I dare trying to use this fuel? I do not remember if I put fuel stabilizer in it when it was parked. I have no easy way to inspect it to see if it has begun to turn to varnish.

Has anyone had any experience with having fuel scrubbed, tank cleaned, etc.? I know this is relatively common on boats, but one of the companies I called has told me that they have never done a RV--and they might have to take the tank out to get it cleaned--surely difficult with close to 500 lbs of fuel in it.

Best to all,
Rob

[HiJoeSilver]

You'll probably have to siphon the gas out of the tank then drop it to clean it out. 6-7 year old gas, even with fuel stabilizer=no good. Since it probably had ethanol in it it probably absorbed some water so you may have some corrosion in there too.

[kyote]

I have diesel, and drained about 20 gallons from a 1/4 drive nut under the tank.

For old gasoline, I have had good luck with a fuel stabilizer and sea foam