I was told to share, so I hope it helps in any way.

Pumping gas.... good things to know.

This is from a friend and he knows !!!!

I've been in the petroleum pipeline business for about 31 years,
currently working for the Kinder-Morgan Pipeline here in
San Jose, CA. We deliver about 4 million gallons in a 24-hour period
from the pipe line; one day it's diesel, the next day it's jet fuel and
gasoline. We have 34 storage tanks here with a total capacity of
16,800,000 gallons.

Here are some tricks to help you get your money's worth:

1. Fill up your car or truck 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 we load is
temperature-compensated so that the indicated gallon gage 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 t ank.

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'

PASS THIS ON- so that others may know too.

 

good to know...

 

i got that in a e mail, some cool stuff

 

#4 is new to me, but it sound like it might work.

 

You know any truth about adding Acetone to your tank? it burns each compression a lot cleaner so its more efficient...i use it in my dirtbikes since it raises octane level. used to use it in my car. But got lazy and havent bought anymore.

the AM to PM fill up i want to know how much you actually save. like .001 gallon or 1 gallon? i guess it adds up.

And LOL at the high speed setting, even that is SLOW! how long does the low setting take? 9 minutes? haha

Thanks for the Info...

 

so with #2 you're implying the gas pumps don't have any kind of filtering? I find that hard to believe...not that I'm questioning your 31 years experience

 

I would think there is filtering but my guess its not filtering it 100% when it stirs up that much dirt.

 

i only knew of #1... good info, thanks!

 

I've been told the same thing by my auto tech instructor to avoid filling up when they're refilling the station. *shrug* I don't know if it's true, but hey, better safe than sorry.

 

Good to know, thanks for the info, didn't know there are 3 speeds on the trigger, I guess when I use the slower setting gotta bring a magazine and snacks cause its gonna take a while, lol

 

http://www.snopes.com/autos/techno/acetone.asp

More acetone discussion:
http://peswiki.com/index.php/Directo...Thermodynamics

As for the original e-mail:
http://www.snopes.com/inboxer/household/gastips.asp

Nothing confirmed by them yet. I've seen that e-mail going around, though. Some moron at work printed and photocopied it. For everyone. Joy.

 

#1 is the only one i know. good to know 3 more. thanks

 

More interesting stuff I found;

Not yet, but in California we're closer to requiring that they do.
http://www.landlinemag.com/todays_ne.../071307-03.htm

Though I'm not sure how significant the difference really is. Ground temperature doesn't fluctuate as much as air temperature. I can't find anything that has exact numbers, but the fact that the storage tanks are undergound actually leads to less temerature fluctuation than you'd think.

The standard temperature for measurement of gasoline is 60 degrees F. Been that way forever it seems. Gasoline is measured at that standard at every point in the process except retail sale. Hence the reason for the 'hot fuel' debate.

At any rate I don't think it's really going to make enough of a difference to fuel before work rather than at lunch or any other time I find convenient. Maybe someone can keep track of mileage and time/temp filled and figure out a % error.

Awesome.

 

Something else that I've run across a few times is the octane rating not being as advertised. Now, I don't know if the manager at this Chevron station was lying to me but, once, I fueled up with 91 only to have my car start cutting boost and shut off the the boost controller. Well, after talking to the manager at the station, I buy gas there all the time since it's right next to my work, he tells me that their octane meter on that pump probably needs adjusting. I say "huh?" I know there are only two tanks at every station, one for 87 and one for 91. And 89 is made by mixing the two. What I didn't know is that if the 91 is more than 91, then the station mixes in a little 87 to bring the rating back down since 87 is cheaper than the 91. The ratings after all are just averages. Now, I can't confirm or deny this but, this is what the manager told me. I've been shopping there for 6 years now and he knows me by name. Whether that means he can lie to me or trusts me is still in the air. After he told me this, I looked into portable octane meters. Not too expensive. The lowest price unit was about $2000. Then I started thinking of some sort of realtime meter for automotive use that will... you get the idea. Anyway, just throwing this out here since we are talking about fuel.

I paid $3.80 a gallon this morning by the way.

Bill

 

its being researched:

http://www.snopes.com/inboxer/household/gastips.asp

For #1, to see how much difference this makes you simply multiply the volume of gasoline (in gallons), the delta T in degreesF, and the gasoline temperature coefficient. For gasoline the API coefficient of expansion is 0.00069/degF.

Assuming you put 12 gallons in and the temperature rises 20degF from the morning to the afternoon:

Volume change = Volume * deltaT * cof = 12 gal * 20degF * .00069/degF = .1656 gal=> 21.2 oz

Don't go fill your car up and then park it!

* from http://ts.nist.gov/WeightsAndMeasures/upload/B-015.pdf

#2 is true. but most of the time when a tanker is filling up they close the station so you cant even pump

#3 and #4 are irrelevant on cars built from 1998 and on.

These cars have ORVR (Onboard Refuelling Vapor Recovery) systems. Long story short, the government decided to put the burden of vapor recovery on the auto manufacturers instead of the gas stations. In an ORVR system, all of the vapor generated during refuelling (and while driving, sitting, sloshing, etc) is stored in a carbon canister. While you drive, a small valve opens and uses the engine vacuum to draw fuel vapor out of the charcoal bed, whereupon it is burned in your engine.

The ORVR system has to be certified in an evaporative shed and cannot produce (vent to the atmosphere) more than 0.02g HC per gallon of gasoline delivered to the fuel tank. Not sure what year the system was mandated on light trucks, but it was on a glide path - like 20% increase each year starting in 2000 or something