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The flowmeters are accurate, but as the pump ages they do wear and lose accuracy. The shiny outside is nothing, the metering pump inside could be 60 years old, be a shaft that is calibrated initially to give one turn per quart, but is connected to a modernised counter to give price in pounds per litre or dollars per gallon or whatever. They do suffer from 2 problems, varying temperature and wear causing fuel to bypass internally, both causing an error. Temperature of the bulk fuel is pretty constant, as it is stored in a underground tank at close to ground temperature. Best is to fill a day after the tanker has replenished, both because the fuel will have cooled to ground temperature and because the water and other dirt will have separated out of the fuel and will not be in the supply that you get. As to the wear, I knew of a pump that, whilst passing the calibration test where they fill a known volume tank from the pump at full flow, this one was worn, and would read very low if you restricted the flow rate to a very low level. I found this out from having a blocked tank breather, so had to fill at a low rate, taking 20 minutes to fill 40l into the tank. Pump read that the full tank was under 20l when I knew it would be around 38l, so I filled up there a few times, until the pump was replaced during modernisation of the forecourt. Not my problem, as I had shown the fault to the station manager, and the owner did little about it.
Ever seen an above ground storage tank?
Quote from: CZARCAR on 21/09/2011 18:38:06Ever seen an above ground storage tank?The gas station nearest to me has above ground tanks that were installed a couple of years ago. I think they are preferred these days because they are less likely to contaminate ground water.
Whew... only $2.20 for gas in the UK...It is just under $4 here...Oh,Was that per liter?That is less than $4 per GALLON here!!!
BTW, why don't they trust you to pump your own gas?
All stations in New Jersey and Oregon offer only full service and mini service; attendants are required to pump gas because customers are barred by statutes in both states from pumping their own gas. New Jersey banned self-service gasoline in 1949 after lobbying by service station owners. Proponents of the ban cite safety and jobs as reasons to keep the ban. Likewise, the 1951 Oregon statute banning self-service gasoline lists seventeen different justifications, including the flammability of gas, the risk of crime from customers leaving their car, the toxic fumes emitted by gasoline, and the jobs created by requiring mini service. In addition, the ban on self-service gasoline is seen as part of Oregonian culture.