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Author Topic: Do you pump slowly, in order to have less air in the gas? Back to Topics
FranklinON

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Ottawa

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Message Posted: Jul 19, 2013 2:24:52 PM

I'm not sure if this is a myth - but I've been told that if you squeeze the pump so the fuel goes at top speed into your car, there's more air going into your tank, and you're paying for air. Conversely, if you have a light touch on the pump trigger, it takes twice as long to fill up but your gas is more 'gas', and less air, with the same overall volume & cost.

I've tried it - and so far all I can see is that I'm getting more volume into the car. Last night I put 42L into my car, which has a 40L tank, and the needle wasn't quite on E yet when I went to fill up.

I wish there were a search function on our forums, so I could find out if this has already been covered. I did check the most recent 5 pages. Does anyone know if pump speed affects the amount of air in your fuel?

REPLIES (newest first) Post a Reply
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BCNU
Champion Author British Columbia

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Message Posted: Sep 16, 2014 1:47:11 AM

no
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sheba24
Champion Author Long Island

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Message Posted: Sep 15, 2014 8:09:34 AM

No
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mohrorless
Champion Author New York

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Message Posted: Sep 15, 2014 6:39:32 AM

I fill quickly until I know I'm near full, then I go slowly..
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estroh
Champion Author Indiana

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Message Posted: Sep 11, 2014 12:03:51 AM

nope
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estroh
Champion Author Indiana

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Message Posted: Sep 10, 2014 4:35:11 AM

nope
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rando991
All-Star Author Missouri

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Message Posted: Sep 9, 2014 12:06:08 PM

huh?
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BartandLisa
Champion Author Newfoundland

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Message Posted: Sep 8, 2014 10:22:45 PM

No
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Not4Nuthn
Sophomore Author Rhode Island

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Message Posted: Sep 6, 2014 9:16:51 PM

no---i want to spend as little time at the station as possible.
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dangasman
Champion Author Michigan

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Message Posted: Sep 4, 2014 5:01:57 PM

the pumps r in the botton of the tank. no air in tank bottom. pumps wont pump air.
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mawtaow
Champion Author Boston

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Message Posted: Sep 4, 2014 4:56:03 PM

no
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44Irish
Champion Author Ontario

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Message Posted: Sep 3, 2014 11:24:43 AM

Makes no sense. The pick up is below the fuel level in the holding tanks.
BUSTED
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pt88
Champion Author North Carolina

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Message Posted: Sep 3, 2014 10:54:29 AM

no
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nichols
Champion Author Halifax

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Message Posted: Sep 3, 2014 9:01:48 AM

do not see how since the only air is what is in your car tank, in the station pump the inlet is down deep in the liquid so no air gets in.
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Rudolf_Golf
Rookie Author Columbus

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Message Posted: Sep 2, 2014 8:48:58 PM

I think we are mixing up feeding babies and fueling up cars. ROFL.
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ace12012
Champion Author Phoenix

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Message Posted: Sep 2, 2014 3:24:50 PM

no.
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kris4956
Rookie Author Louisiana

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Message Posted: Sep 2, 2014 1:10:59 PM

Never heard of it. Will have to give it a try.
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sagnat
Champion Author Riverside

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Message Posted: Sep 2, 2014 12:22:15 PM

I pump slowly for the last half gallon or so...because diesel fuel foams.
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sheba24
Champion Author Long Island

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Message Posted: Sep 2, 2014 11:42:28 AM

No
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jwb1013
Rookie Author Detroit

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Message Posted: Sep 2, 2014 11:27:48 AM

No, but I'm going to try it
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SGLuz
All-Star Author Modesto

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Message Posted: Sep 2, 2014 11:11:36 AM

No
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estroh
Champion Author Indiana

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Message Posted: Sep 2, 2014 12:06:10 AM

nope
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Not4Nuthn
Sophomore Author Rhode Island

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Message Posted: Aug 31, 2014 9:46:47 PM

no---- because i don't think it would make a difference.
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46chief
Champion Author Indiana

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Message Posted: Aug 31, 2014 1:22:30 PM

Usually.
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krazkar
Champion Author Calgary

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Message Posted: Aug 31, 2014 12:13:39 AM

no
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8_Ball2014
All-Star Author North Dakota

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Message Posted: Aug 30, 2014 11:58:42 PM

no
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diesdown
Champion Author North Carolina

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Message Posted: Aug 30, 2014 4:47:29 PM

Fast, then slowly.
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jenksjr
All-Star Author Washington

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Message Posted: Aug 30, 2014 4:28:25 PM

It's not likely that you are paying for air. The suction of the pump is immersed in the liquid and can not suck air into the pump. The pump would not work properly and it would be a safety hazard if air was introduced into the suction and pump piping.
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heyman_31036
Sophomore Author Georgia

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Message Posted: Aug 30, 2014 4:02:57 PM

Great answer blogfrog81.

I have tried to shake my truck's bed before to see if I could get more fuel in. Not sure if it helps.
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PithyOpiner
Champion Author Stockton

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Message Posted: Aug 18, 2014 2:30:59 PM

One time I pumped so slowly that I hardly had any air to breathe and nearly passed out right there at the gas station. I'll never pump so slowly again!!

[Edited by: PithyOpiner at 8/18/2014 2:31:39 PM EST]
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thomnrosie
Sophomore Author San Jose

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Message Posted: Aug 18, 2014 12:51:57 PM

Sometimes I do that but not really sure if it is true.
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inventorymaster
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Message Posted: Aug 18, 2014 8:19:40 AM

no
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nichols
Champion Author Halifax

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Message Posted: Aug 18, 2014 8:08:57 AM

only gas coming out the pump, any air is coming out of your gas tank
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kdanish
All-Star Author Santa Barbara

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Message Posted: Aug 8, 2014 10:38:51 AM

No
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tkawashima
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Message Posted: Aug 8, 2014 10:24:57 AM

No
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pt88
Champion Author North Carolina

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Message Posted: Aug 8, 2014 10:11:18 AM

no
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gvan
Champion Author Chicago

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Message Posted: Aug 8, 2014 9:58:43 AM

No. Full power!
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DDubyu
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Message Posted: Aug 8, 2014 5:03:18 AM

No
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estroh
Champion Author Indiana

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Message Posted: Aug 8, 2014 4:42:30 AM

nope
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MertieMan
Champion Author Lexington

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Message Posted: Aug 6, 2014 6:11:47 AM

No, it really doesn't matter how fast you pump, this is just another myth.
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estroh
Champion Author Indiana

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Message Posted: Aug 6, 2014 12:51:23 AM

nope
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tkawashima
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Message Posted: Aug 4, 2014 10:55:19 AM

No
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estroh
Champion Author Indiana

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Message Posted: Aug 4, 2014 9:41:35 AM

nope
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blogfrog81
Rookie Author Dayton

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Message Posted: Aug 3, 2014 4:34:40 AM

I've been in petroleum distribution business for about 6 years, currently working for the Huang Oil Company here in Dayton, OH. I have researched all of the facts and have found some tricks to help you get your money's worth:

1. Fill up your auto 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 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'

BlogFrog81
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DAWGnh
All-Star Author New Hampshire

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Message Posted: Aug 3, 2014 2:01:34 AM

LOL no
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ScottAdams5
Champion Author New York

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Message Posted: Aug 3, 2014 1:38:04 AM

Why do you ask?
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mybigtruck
Champion Author San Jose

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Message Posted: Aug 3, 2014 1:19:48 AM

Why would there be air in the fuel being pumped in? I squirt it in at full rate.
Pumps suck from the bottom of the tank. Air is on top.
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estroh
Champion Author Indiana

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Message Posted: Aug 3, 2014 1:12:58 AM

nope
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mawtaow
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Message Posted: Aug 2, 2014 6:01:26 AM

no
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hjl17
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Message Posted: Aug 1, 2014 8:16:39 AM

No
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Seekingone
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Message Posted: Aug 1, 2014 8:00:02 AM

yes
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