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Post by mrsanimalbus on Nov 21, 2007 1:41:19 GMT 1
  A few tips i came across on web about refuelling your car .  1. Fill up your car or dub 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. Every truckload that is loaded is temperature-compensated so that the indicated gallonage is actually the amount pumped. A one-degree rise in temperature is a big deal for businesses, but service stations don't have temperature compensation at their pumps. 2. 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. 3. 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.) 4. 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' also, keep your tyres pumped up, this means you'll use less fuel in the first place Having the oil and filters changed regularly helps too.
i copied this from an american site, but thought it would be a bit helpful, but i'm sure that axenige will point out any differences, if there are too many, i'll delete this thread 
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Post by axenige on Nov 21, 2007 2:06:59 GMT 1
I've heard the specific gravity thing before, this is true to a lesser extent. All liquids are effected by extreme changes in temperature. This is due to the T.G.F. (very completed too long to explain) the up shot is the lower the temperature the lower the specific gravity is. This is why a Car battery at the end of its life span fails during the first winter cold snap, it actually has less amp-age than it would in warmer weather.
The amount of real difference that filling up in the morning makes is minimal, and you must allow for expansion anyway, so in theory if you followed this statement to the letter and say filled up your vehicle to the neck on a cold morning, and then parked it up without using it in direct sunlight then your extra fuel would just naturally evaporate off when the safety valve on the filter cap opened.
Point 4 does not work here in the U.K. Gasoline pumps in the U.S. work differently to ours, you'll see in American movies that they place the nozzle of the pump into the filler neck and then pull the trigger to start pumping the gas, they more than likely then go off and do something else before coming back to the car and withdraw the nozzle, this is because there is a trip lever built into the trigger of the fuel nozzles handle which means when the trigger is pulled once and then locked in the open position, the pump will continue to deliver fuel into the cars tank until ether the trigger is pulled again, or the fuel tank is filled up. This is because U.S. Gas pumps do not require the user to hold the trigger in contently as they have a pressure cut off switch built into the pump. The main reason for this feature is that some American vehicles have very large fuel tanks, and Americans are lazy ;D
Also as a side note too all this the blend of fuel is different between summer and winter for some of the above reasons, if you lay your vehicle up and do not use it then try and run the fuel tank fairly low before moth balling your vehicle. You can also add something such as STP petrol treatment to the fuel to help keep it fresh.
WHY Nige! I hear you all cry,
Well if you have cold weather fuel in you vehicle and then come early summer think I'll know I'll take it out for a spin, you could have problems. Such as vapor lock in the system or vaporising problems at the fuel pump or carburettor. How do I know things because every summer I had this problem with the jeep.
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Post by Smokeydub on Nov 22, 2007 0:30:56 GMT 1
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Post by axenige on Nov 22, 2007 0:35:01 GMT 1
due to the flash point of acetone about - 20 degeres C and general combustibility of the stuff I would of thought it would create high load knock (pinking), due to fuel pre-detonation, plus I would have thought in the low compression OHV engines that it could do more harm than good.
Normal Unleaded has a flash ponit of about -40 degres C, however Acetone does have a much higher rate of evavopration and a slightly higher specific gravity than that of petrol.
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Post by Smokeydub on Nov 22, 2007 0:45:27 GMT 1
I think I'd have to agree with you nige! ;D
I've worked with acetone quite a lot in the past and it's quite scary how quickly the stuff can eat through plastics and rubber, so I can imagine what it could do to engine parts.
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Post by axenige on Nov 22, 2007 1:08:40 GMT 1
Yep mate me too, as we were saying at the weekend about the stuff its very nasty, and also when it has vaporised, becomes a very potent airborne explosive agent.
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Post by Smokeydub on Nov 22, 2007 1:20:55 GMT 1
I know acetone vapours are very dense so they have a habit of hanging around!!!
Apparently, years ago at work, a guy was hoovering around an enclosed space that had been cleaned with acetone. The hoover must have filled with the vapours which were ignited by the motor, and boom!!!!
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Post by Toughjeans on Nov 22, 2007 23:12:43 GMT 1
I know acetone vapours are very dense so they have a habit of hanging around!!! Apparently, years ago at work, a guy was hoovering around an enclosed space that had been cleaned with acetone. The hoover must have filled with the vapours which were ignited by the motor, and boom!!!! bugger, and i bet he had to hoover the room all over again!! |
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Post by axenige on Nov 23, 2007 0:53:51 GMT 1
I know acetone vapours are very dense so they have a habit of hanging around!!! Apparently, years ago at work, a guy was hoovering around an enclosed space that had been cleaned with acetone. The Hoover must have filled with the vapors which were ignited by the motor, and boom!!!! bugger, and i bet he had to Hoover the room all over again!! No more like some else had to hover him up M8, acetone is very nasty. A similar thing happen at the Humbrol paint factory there the people who make those little tins of paint for model kits, well someone was cleaning out the store room and washed the floor with pure acetone, and when he was finished he lit a cigarette, well the only thing they ever found of him after the explosion was his wedding ring, the rest of him was vaporised  plus it burn down the whole factory  |
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