Water in the gasoline from the Gas Station?
This has happened twice when filling up the 1991 560SEL. I normally use the HEET product to break up the water; does anyone know any way of testing the gasoline for water PRIOR to fueling up the car? Also, does water in the gasoline require changing the fuel filter(s)??
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We had that problem with a station in Carson City. Word got around to not buy there. That place no longer sells gas. I don't know of any other field tests except maybe pumping a sample into a clear container and letting it sit to see if water collects at the bottom.
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How do you know that water is in the fuel?
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Test methods for water in fuel
Test Methods for Water in VO | Quality Testing a carbide manometer would work on gasoline, some of the other methods would not work obviously. |
Doesn't the 10% ethanol that makes up most gasoline combine with the water and keep the water suspended in solution? Where I live all gas, regardless of brand, has some additive or another to absorb water. It comes that way right from the refinery.
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Yep, built in " dry gas ".
The test for alcohol in gasoline is to draw a fuel sample in to graduated cylinder, note volume, add a measured volume of water, shake then read the amount of water that does not mix. ( It will remain on the bottom. ) The higher alcohol content, the less free water in the cylinder. A chart exists to convert the water volume to % alcohol. |
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The gas station has a paste that they smear on the end of their measuring stick for checking tank levels that changes color with water. The water sits at the bottom of the tank, and shouldn't be allowed to exceed a certain level, where the suction inlet is. You can ask them, or wait until the fill truck comes by.
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If it happens consistently, missing could be an ignition problem. |
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I think the bad gas may have come from the convenience store, but I have no proof. The car was not missing and idled smoothly prior to yesterday's gas mishap. |
when I was manager at a gas station years ago we had a paste to rub on the gallons stick that would turn a color if water was present.
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It does sound like bad gas. It may not be water in the fuel. Old gas will do funny things as well. If the station doesn't do much volume the fuel could have gotten a bit aged. Modern gasoline goes bad a lot faster than the old stuff did. I would probably just run it down some and then fill with good gas.
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You still don't know for sure if you have new water each time you added fuel. The 10%ethanol content in gasoline is a Federal law, it is unlikely your regular station is selling non road legal fuel. ( unless there is some sort of work around I don't know about. ) According to your past posts, I count 3 fuel stops you attribute to bad fuel, it is pretty unlikely that 3 different stations all had "bad" fuel. A clogged fuel filter won't cause an idling problem unless it is so clogged that the car won't go faster than 10 MPH. Faster speeds = more fuel flow through the filter, if it flows enough fuel to move the car it will flow enough for idle speeds. Don't guess at problems, diagnose. |
Here in Canada most premium grade gasoline has no ethanol, mid grade a little, and regular contains a lot by comparison. The ethanol requirement is an across-the-board average, so they get their average required percent by doping the regular.
A simple 'shake-up' test with gasoline in a tall glass container with an inch of water in the bottom will let you calculate the alcohol percent. |
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