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

All-Star Author
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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Cruiser001
Veteran Author Michigan

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Message Posted: Oct 16, 2014 10:02:10 PM

I pump as fast as it will go
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FranklinON
All-Star Author Ottawa

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Message Posted: Oct 16, 2014 1:18:41 PM

@ TheOldMan25177, thanks for your informative and serious response. Much appreciated.
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FranklinON
All-Star Author Ottawa

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Message Posted: Oct 16, 2014 1:16:35 PM

:-) Hadn't thought of that.
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J Eric
Champion Author Los Angeles

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Message Posted: Oct 15, 2014 3:32:21 AM

I pump slowly to allow the dinosaurs beneath the station to ferment just a little bit longer.
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estroh
Champion Author Indiana

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Message Posted: Oct 15, 2014 12:12:34 AM

nope
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luvmyrv
All-Star Author Winnipeg

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Message Posted: Oct 13, 2014 8:52:59 AM

Total myth...same as filling something with water...the air will get displaced by the liquid.
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estroh
Champion Author Indiana

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Message Posted: Oct 13, 2014 12:23:21 AM

Nope
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WES03
Champion Author Maryland

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Message Posted: Oct 11, 2014 8:39:45 AM

I do not.
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tiny1oh
Champion Author Akron

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Message Posted: Oct 11, 2014 6:52:00 AM

no
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sheba24
Champion Author Long Island

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Message Posted: Oct 5, 2014 7:25:56 AM

No
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John_Doe
Champion Author Northwest Territories

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Message Posted: Oct 5, 2014 7:12:59 AM

no
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CptSteve
Champion Author Illinois

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Message Posted: Sep 29, 2014 11:30:53 AM

Sounds like a myth to me.
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rando991
All-Star Author Missouri

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Message Posted: Sep 29, 2014 8:31:38 AM

naw!
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sheba24
Champion Author Long Island

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Message Posted: Sep 29, 2014 8:21:47 AM

No
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TheOldMan25177
Sophomore Author Charleston

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Message Posted: Sep 29, 2014 5:17:17 AM

Myth... The air you speak of is not in the gas at the meter inside the fuel dispenser, it is foamed at the nozzle when the fuel goes thru it.
Our dispensers are checked and certified by state inspectors and during that certification both full speed and slow speed dispensing is performed.
There is a range of accuracy that is allowed during the testing, which is the same at both speeds. The meters could in fact show a slight difference in volume at the different speeds but not enough to make any noticeable difference to the consumer.

You can get the same amount of fuel in your tank pumping fast as you can pumping slow, at fast pumping you may have to go slower at the end of your fill so that the foam foam burping back up the filler neck does not shut off the nozzle.
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MertieMan
Champion Author Lexington

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Message Posted: Sep 29, 2014 4:04:39 AM

Another myth, I pump fast as I can.
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pandora257
Sophomore Author Kentucky

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Message Posted: Sep 29, 2014 12:43:23 AM

hmmm...first i've heard of this
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estroh
Champion Author Indiana

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Message Posted: Sep 29, 2014 12:40:22 AM

Nope
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hjl17
Champion Author Toronto

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Message Posted: Sep 28, 2014 7:44:05 AM

No
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cv
Champion Author Raleigh

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Message Posted: Sep 28, 2014 6:19:11 AM

I used to do that, but not now.
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RadarIN
Champion Author Indiana

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Message Posted: Sep 28, 2014 6:07:21 AM

no
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Thumper52
Champion Author New Brunswick

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Message Posted: Sep 28, 2014 5:44:27 AM

No
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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
All-Star 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
Sophomore 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
All-Star 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
Champion 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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