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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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tiny1oh
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Message Posted: Dec 21, 2014 6:04:51 AM

no
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Thumper52
Champion Author New Brunswick

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Message Posted: Dec 21, 2014 5:44:06 AM

No
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hjl17
Champion Author Toronto

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Message Posted: Dec 2, 2014 8:23:58 AM

No
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47pickup
All-Star Author Minnesota

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Message Posted: Dec 2, 2014 7:09:28 AM

No
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Mitchsoc
Veteran Author Indianapolis

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Message Posted: Dec 2, 2014 7:07:11 AM

no
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sheba24
Champion Author Long Island

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Message Posted: Dec 2, 2014 6:35:24 AM

No
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cv
Champion Author Raleigh

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Message Posted: Dec 2, 2014 6:20:28 AM

No, I just slow the flow as the tank nears full.
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tkawashima
Champion Author Honolulu

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Message Posted: Nov 29, 2014 10:10:05 AM

No
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hjl17
Champion Author Toronto

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Message Posted: Nov 29, 2014 9:10:07 AM

No
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stonejd
Champion Author Illinois

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Message Posted: Nov 29, 2014 9:07:18 AM

no
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pt88
Champion Author North Carolina

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Message Posted: Nov 29, 2014 8:59:41 AM

No
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Thumper52
Champion Author New Brunswick

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Message Posted: Nov 29, 2014 5:31:19 AM

No
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GasMiser718
Champion Author Detroit

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Message Posted: Oct 30, 2014 3:49:18 PM

No, it sounds like a myth to me.
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Mitchsoc
Veteran Author Indianapolis

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Message Posted: Oct 30, 2014 8:34:02 AM

No
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rando991
Champion Author Missouri

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Message Posted: Oct 30, 2014 8:32:59 AM

near the end yes
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tiny1oh
Champion Author Akron

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Message Posted: Oct 30, 2014 8:30:06 AM

no
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mandydonnaprinc
Champion Author Hamilton

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Message Posted: Oct 23, 2014 7:27:33 AM

n
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hjl17
Champion Author Toronto

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Message Posted: Oct 23, 2014 7:15:41 AM

No
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NickoliMB
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Message Posted: Oct 22, 2014 4:31:44 PM

Just to top up.
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Midnit
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Message Posted: Oct 22, 2014 3:15:54 PM

No
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GrumpyCat
Champion Author Alabama

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Message Posted: Oct 22, 2014 2:04:17 PM

As FranklinON has observed the pump measures the same at all delivery rates.

I don't find gasoline foams as FranklinON claims. But when filling a 2004-2009 Prius the gas tank is a bladder which has to expand when filling. I did find it helped to pump on the slowest rate so as to let the bladder expand its folds.

Diesel foams very easily. Takes about a minute to settle. About a minute after the nozzle cuts off the tank holds about 5% more.
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bhWY
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Message Posted: Oct 22, 2014 1:55:54 PM

no
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Cruiser001
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Message Posted: Oct 22, 2014 1:30:40 PM

Nope
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stonejd
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Message Posted: Oct 22, 2014 1:25:03 AM

no
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estroh
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Message Posted: Oct 22, 2014 12:34:27 AM

Nope
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WilhamClouse
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Message Posted: Oct 21, 2014 11:53:01 PM

no
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ScottAdams5
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Message Posted: Oct 21, 2014 11:32:59 PM

Why do you ask?
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8_Ball2014
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Message Posted: Oct 21, 2014 11:22:37 PM

no
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Cruiser001
All-Star 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
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Message Posted: Oct 15, 2014 12:12:34 AM

nope
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luvmyrv
Champion 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
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Message Posted: Oct 13, 2014 12:23:21 AM

Nope
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WES03
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Message Posted: Oct 11, 2014 8:39:45 AM

I do not.
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tiny1oh
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Message Posted: Oct 11, 2014 6:52:00 AM

no
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sheba24
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Message Posted: Oct 5, 2014 7:25:56 AM

No
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John_Doe
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Message Posted: Oct 5, 2014 7:12:59 AM

no
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CptSteve
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Message Posted: Sep 29, 2014 11:30:53 AM

Sounds like a myth to me.
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rando991
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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
Veteran 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
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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
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Message Posted: Sep 28, 2014 7:44:05 AM

No
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cv
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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
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Message Posted: Sep 28, 2014 6:07:21 AM

no
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Thumper52
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Message Posted: Sep 28, 2014 5:44:27 AM

No
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BCNU
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Message Posted: Sep 16, 2014 1:47:11 AM

no
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