hardrockminer post=846635If the smell is a concern and potential explosion negates any volatiles...Why not use straight water? You can simply calculate a different setting. Without doing the math it would be around 4.5 mm plus or minus 1.0 mm.
Odor is less a concern than fire safety and toxicity. Handling can be mitigated using nitrile gloves, but fire safety from vapor is foremost & airborne toxicity must be kept in mind.
We have an ancient, whole-house, 1/2 horse belt-driven attic window fan we place at the outside basement door during warm weather that moves a huge amount of air from inside to outside. Enough that if we don't open the basement (or any) window, the negative pressure in the house creates a back draft in the water heater flue that usually extinguishes the pilot light. Opening the basement (or any upstairs) window & running the fan when it's cold outside is a non-starter.
We documented the results using tap water in the OP. See pics. We'll experiment again this year using distilled water to eliminate the possible variables and mineral contaminants in tap water & calculate from there, switching between water and fuel repeatedly (at least three times) to confirm results. We just have to do it outdoors while switching between water and fuel while experimenting.
Still looking for vessels that have a bottom drain nipple like the one in the video.
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.
E15 gasoline has an SG of about 0.76, but gasoline in general can vary between about 0.70 and 0.80, depending on grade, additives and time of year. Methyl hydrate has an SG of about 0.79, so on the higher end of gasoline and about 4% higher than E15 gas. The higher SG would cause the floats to ride higher and close the float valve a little sooner. A difference of 4% on 3.5 mm is 0.14 mm. I doubt that anyone could visually detect that difference, and in any case it is well within the plus or minus 1.0 mm margin of error. Sounds like it's worth a test.
Straight ethanol is also .79 SG and I think would be less toxic via inhalation than gasoline and somewhat less volatile.