Pumping gas in the morning?
09-15-07, 09:43 AM
#16
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Most of basic premises of the email are seem to be correct, but without details of how much gas we are talking it means nothing. My guess is the difference in volume between daytime temps and nighttime temps really isn't significant. Even more so if you are trying to reduce the amount of gas vapor that doesn't make it into your tank. There are probably plenty of better ways to save energy/money. Instead of wasting your time pumping your gas slowly or waiting for the ground temperature to drop. Just a hunch.
08-19-08, 01:27 PM
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It looks like many here have done a pretty good job of answering this one... (snopes is a GREAT place to debunk internet myths).
My .02 = I work in the industry, pumping, among other things, gasoline all over the L.A. basin. While it is true that temperature makes a big difference across large volumes, (and all of my meters are corrected for temperature and gravity), the difference is negligible when pumping small amounts like 20, 30, 50, even 100 gallons. We pump tens of thousands of barrels at a time, (one barrel = 42 gallons), so it is essential to correct for temp and gravity. As to vapors, pumping at the fastest rate into your tank at the gas station will indeed cause more turbulence, and as a result, more vapors, but you are not losing any liquid gasoline. The vapor return is designed to reduce the amount of vapors that go to the atmosphere, which is an AQMD, (Air Quality Management District), issue. Again, the amount of vapors lost, if condensed into liquid, would be negligible. The difference between the first pump setting and the higher one is not that great.
In case anyone is interested, here is a study done by the California Department of Weights and Measures. It doesn't give a quantified difference of actual pumped volume, only a comparison of temperatures at the time of pumping:
http://www.cdfa.ca.gov/dms/fueltemps...empReports.pdf
My .02 = I work in the industry, pumping, among other things, gasoline all over the L.A. basin. While it is true that temperature makes a big difference across large volumes, (and all of my meters are corrected for temperature and gravity), the difference is negligible when pumping small amounts like 20, 30, 50, even 100 gallons. We pump tens of thousands of barrels at a time, (one barrel = 42 gallons), so it is essential to correct for temp and gravity. As to vapors, pumping at the fastest rate into your tank at the gas station will indeed cause more turbulence, and as a result, more vapors, but you are not losing any liquid gasoline. The vapor return is designed to reduce the amount of vapors that go to the atmosphere, which is an AQMD, (Air Quality Management District), issue. Again, the amount of vapors lost, if condensed into liquid, would be negligible. The difference between the first pump setting and the higher one is not that great.
In case anyone is interested, here is a study done by the California Department of Weights and Measures. It doesn't give a quantified difference of actual pumped volume, only a comparison of temperatures at the time of pumping:
http://www.cdfa.ca.gov/dms/fueltemps...empReports.pdf
Last edited by ISWillie; 08-19-08 at 01:30 PM.
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