BEWARE Don’t Get Fleeced At Petrol Pumps - VERY IMPORTANT INFORMATION.
Do Not Pump Full Tank Of Petrol
Many of us are not aware that the petrol kiosk pump has a return pipe-line (in Pink). When the petrol tank (in the car) reaches full level, there is a mechanism to trigger off the pump latch and at the same time a return-valve is opened (at the top of the pump station) to allow excess petrol to flow back into the pump. But the return petrol has already pass through the meter, meaning you are donating the petrol back to the Oil Dealer. This fact I recently came across through a very useful tip. I was surprised to know it but had a doubt so I talked to one of the pump technicians and he too accepted it as a fact. I think apart from providing space for the gas generated inside the petrol tank this is yet another reason why we shouldn't fill the tank to the brim.
So What To Do?
Well These Tips Might Help
1.Do not top off your gas or fuel tank, when the pump shuts off, do not keep trying to add more gas. A friend who owns a gas station says that by doing this, you are actually giving the next customer a $1.00 worth of fuel. The fuel you pump stays in the hose and never makes it to your tank.
2. Fill up your car in the morning when the temperature is still cool. Remember that all service stations have their storage tanks buried below ground; and the colder the ground, the denser the gasoline. When it gets warmer gasoline expands, so if you're filling up in the afternoon or in the evening, what should be a gallon is not exactly a gallon. In the petroleum business, the specific gravity and temperature of the fuel (gasoline, diesel, jet fuel, ethanol and other petroleum products) are significant. A one-degree rise in temperature is a big deal for businesses, but service stations don't have temperature compensation at their pumps.
3. If a tanker truck is filling the station's tank at the time you want to buy gas, do not fill up; most likely dirt and sludge in the tank is being stirred up when gas is being delivered, and you might be transferring that dirt from the bottom of their tank into your car's tank.
4. Fill up when your gas tank is half-full (or half-empty), because the more gas you have in your tank the less air there is and gasoline evaporates rapidly, especially when it's warm. (Gasoline storage tanks have an internal floating 'roof' membrane to act as a barrier between the gas and the atmosphere, thereby minimizing evaporation).
5. If you look at the trigger you'll ! see that it has three delivery settings: slow, medium and high. When you're filling up do not squeeze the trigger of the nozzle to the high setting. You should be pumping at the slow setting, thereby minimizing vapors created while you are pumping.
Hoses at the pump are corrugated; the corrugations act as a return path for vapor recovery from gas that already has been metered. If you are pumping at the high setting, the agitated gasoline contains more vapor, which is being sucked back into the underground tank, so you're getting less gas for your money.
Hope this will help ease your 'pain at the pump.
PLEASE PASS THIS ON
Even if this doesn't pertain to you....Pass it on to your family and friends. It may be useful to save someone's hard earned money.