Posted by lnk on March 29, 2016 at 15:30:45 from (73.253.4.92):
In Reply to: Gas tractor issues posted by kickinbull on March 27, 2016 at 04:35:23:
As someone who works in the fuel industry, when the change to 10% Ethanol was coming about, we had to clean the Underground storage tanks at all gas stations prior to the switch. We used water jets and suction pumps to suck the tank crud out. This is because the tanks, underground for up to 25 years, had accumulated garbage (my term) in the tanks, and that crud stayed in place through the drain and refill cycles of the tanks. When ethanol was added to the fuel, all the "stuff" in the tanks that we could not clean out, became loosened. Which got pumped to the filters in the dispensers. Which we were changing weekly for about 3 months.
So, the ethanol has a cleaning power that straight gasoline does not have, at least in the 87 octane. (Big oil company 93 has additives that do clean).
Another property that the ethanol blend has that straight gasoline does not have, is the ability to blend with water, but only up to a certain amount. If your storage allows any water in, the ethanol will be separated out of the gasoline (phase separation). This is easily discovered by stalled cars at the exit to the gas station. As the water pulls the ethanol out of the gasoline, it quickly settles to the bottom of the tank where it is pumped from the bottom (all stations pump from the bottom), directly into customers cars. There are filters that block the flow when phase separation occurs, but not all stations use them.
Yes, most vehicles will run better and get better mileage on straight gasoline. We averaged 24 miles to the gallon on our Ford Minivan we had at the time from Bristol TN to NJ, yet only 20 MPG over the same stretch of road on 10% ethanol blend.
I am not sure why ethanol came to be in our fuel. I am pretty sure it was someone buying votes buy giving out subsidies. But that is a subject for another thread.
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