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Old 02-07-2001, 10:35 AM   #1
Bobalouy
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Post New gas pumps at the gas station?ripoff?

The other day I was getting gas, and reacently the local Texico got new pumps, the kind with only one nossel for all three types of gas. Usually when I'm getting gas I'm just in a daze watching cars pass, but for some reason yesterday I was actually thinking.That hose is pritty long, so it probably holds at least a gallon of gas. If the person befor me used the lowest grade gas, and I put in the Highest grade that means, the left over cheep gas in the hose is the first thing that went in my tank. So that's one gallon of gas that I'm paying the high price and getting the low grade gas, and the gallon of high grade that I paid for is in the hose for the next person. I'm not a worried about the extra money I just don't want that low grade in my gas tank.

Does this sound logical to anyone or am I just wierd?

Anthony C.
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Old 02-07-2001, 10:38 AM   #2
bratmantlz
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Have a Nice Day?

hey that does sound like what would happen.. *** that makes me want to go to stations with three hoses one for each grade hmmm got me thinking. the monkey speeks for me gas costs an arm and a leg anyways.
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Old 02-07-2001, 10:47 AM   #3
crash
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Post

I'm not sure about your theory, although it sounds very sound....

I do know that those types of pumps mix low grade and high grade together to make mid grade....

That way the gas stations only have to buy 2 grades instead of 3 (and have only 2 underground tanks instead of 3) Also, calling those things pumps is not really accurate anymore, the pumps are now in the ground, and the "dispensers" just spit it out and track how much you've gotten.

The pumps are the ones that are mechanical and make that humming sound when you flip the on switch....

(I have a friend that used to service pumps and dispensers at gas stations)

-Nate
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Old 02-07-2001, 10:48 AM   #4
scoobiejosh
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unless you have a turbo you want the low octane gas anyways. We dont need high octane. but i do see your point.

Josh
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Old 02-07-2001, 10:49 AM   #5
enuttage
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How 'bout this?

You stop on the way home from work/school 'cause you're low on gas. You don't have a lot of flow, but you've got a five spot in your pocket. You pump that 3 gallons of gas into your car, one gallon of which is 87 octane (fill in lowest grade in your location).

Not good for the brand new WRX requiring at least 91 octane. I know it's not gonna fry your car right then and there, but long term, it sure isn't good for it.

-Eric B.
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Old 02-07-2001, 11:22 AM   #6
scoobiejosh
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sorry my last post was for a non-turbo 2.5. Or any other normaly aspirated car with compression as low as a 2.5. just clairfying. If you got a WRX or other turbo go to the next gas station, should be one on the oposite corner. Exxon and Mobile are the only ones i got to and they dont do the single "dispencer" stuff.

Josh
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Old 02-07-2001, 11:30 AM   #7
Lix
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I don't think it's that big a deal...the pump probably only pumps when it is in use. When the pump is not in use gravity (edit: whoops...not gravity, but through principals used in Bernolli's equation. Since the pressure in the atmosphere is higher than in the tank, which is a vacuum, the fluid will go back into the tank)will be acting on the fluid in the fuel lines and pull them back into the tank. I doubt the gas station is going to pay for a pump that holds fluid inside the hose when it doesn't need to. At most you'll probably be getting some 87 Octane residules.

[This message has been edited by Lix (edited February 07, 2001).]
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Old 02-07-2001, 11:41 AM   #8
8Complex

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Actually gravity would cause most of that to fall to even out with the level of the filler. At 7.48gal/cu.ft. let's say 48" of the hose is below the filler and the hose is 3/4" ID... thats 21.21cu.in. (.0122 cu.ft.). .0122 of 7.48gal is .091 gallons.

Looks like you're only getting about .1gal or so from that hose. I'm sure most/all of it that is pumped up to the top of the unit (station pump) is drained back into the tank by gravity or at least it may be split at the top of the unit in which case there is probably less then a foot of hose between the junction and the hose leading to the filler which may still have gas in it.

All in all, you aren't getting much low-grade fuel there. Feel better now?
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Old 02-07-2001, 11:53 AM   #9
enuttage
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Ahhh, the unaccounted for miracle of the siphon.

-Eric B.
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Old 02-07-2001, 01:36 PM   #10
8Complex

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Ahhhhh... I forgot about the driving valve in the handle. Well even if there is 12 feet of hose, that is still only .3 gallons of gas to the top of the hose, though.
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Old 02-07-2001, 01:51 PM   #11
Steve Theodore
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Cool

Don't worry because your ECU will adjust for the lower grade gas. Just don't crank up the boost on the WRX if you have crummy gas in the tank. For normal driving, it won't be a big deal.

Steve
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Old 02-07-2001, 01:58 PM   #12
Gambit
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talk about paranoia.

i use regular. therefore i don't have the worries.
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Old 02-07-2001, 03:58 PM   #13
CosmoTheCat
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I find that I like to go to gas stations with the old non-vapor recovery nozzles. They spill a lot less. I can stick my ear (and nose too!) by the filler and listen for the gurgles. I also shut the pump off and keep squeazing the handle to get the last drops. Once I had a good steady stream of gas for 30 seconds after the pump stopped... all that would have been left in the hose. So the guy behind me got to pay to fill the hose back up!
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Old 02-08-2001, 12:00 AM   #14
micah
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I don't think it would be a gallon. Somebody look at the ID of that hose (I think its printed on it) and estimate the length and do the calculation, or post the stuff and I will. Hold on... lets say 12' of 0.75" ID hose, that's about a quart. Say you only get 5 gallons. 1 quart 87 + 4.75 gallons 91= 90.8 octane. Should be fine.

mbs
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Old 02-08-2001, 12:07 AM   #15
El Kabong
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Ah, very interesting... Never thought about it before... I guess the solution is to just pump that first hose worth onto the ground, then start filling up your car... hehehe... just kidding of course. I'd be curious to know how much is actually in the hose.
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Old 02-08-2001, 12:10 AM   #16
Opie
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Wink

Or think about it the other way...if the guy before you got premium, and you wanted the regular grade...you would be getting a little premium for the price of regular grade!
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Old 02-08-2001, 12:35 AM   #17
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good call opie...

i bet your glass is always half full !

Brad
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Old 02-08-2001, 12:38 AM   #18
ImprezedRS
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Ok i will put my thought into this one since i worked at a gas station. Ok i do agree that there is at least a half gal of fuel in the line since it is in a U shape conected to the very top of the pumps. but emough of that this is where the truth shows through. Ok have you ever seen someone drive off with the nozzle still in the car, well if you have the hose usually breaks and fuel goes everwhere well that fuel is what was in the hose as there are two vavles on the hose, one inside the pump and one on the nozzle so when you turn off the valve on the nozzle it stops the fuel from going out then after you pay the clerk truns off the vavle before the hose you can't get any gas till they authorizes it(thats why it take so long sometime for the pump to come on) so when its not in use both valves would be closed so fuel would still be inside the hose.
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Old 02-08-2001, 12:53 AM   #19
Bobalouy
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Post

Well I guess its not that big of a deal but at least I got some people thinking.

Anthony C.
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Old 02-08-2001, 12:59 AM   #20
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just squirt a gallon er so into the window washer deal
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