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Author Topic: Ever Wonder How a Gas Pump Knows When to Click Off? ‘It’s Actually Surprisingly Complicated’ Back to Topics
THZebra
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Indiana

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Message Posted: Oct 12, 2013 3:35:36 PM

You’re standing at the pump, watching the gallons and dollars tick higher and higher. Then, click, the pump stops. You’re done.

But have you ever wondered how the nozzle knows your tank is full?

The YouTube channel BrainStuff tackled this question.

“It’s actually surprisingly complicated,” host Josh Clark said.

Picture a tube with a substance — gas or liquid — flowing through it. The center of the tube is pinched, causing the fluid coming out on the other side of the pinch to be compressed and changing pressure. On a gas nozzle, a hole at the end allows air to flow up a tube into an air sack in the handle. But when the tank becomes full and liquid covers the hole, sucking up denser gas into the tube instead of air, a change in in pressure occurs. This collapses the air-filled
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REPLIES (newest first) Post a Reply
oldmack
Champion Author Riverside

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Message Posted: Oct 14, 2013 3:14:47 AM

ok
blupupher
Champion Author Houston

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Message Posted: Oct 13, 2013 10:39:57 PM

never really thought about it, but makes sense.
PDQBlues
Champion Author San Diego

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Message Posted: Oct 13, 2013 9:03:47 PM


Cool technology. Humans can get very creative when they us science rather than denying it.
molebaby96
Champion Author Tallahassee

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Message Posted: Oct 13, 2013 10:28:24 AM

Clicks off to soon for me.
wamster
Champion Author Houston

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Message Posted: Oct 13, 2013 10:25:12 AM

I somewhat knew this. I remember venturi meters from a water district.
MadFueler
Champion Author Winston-Salem

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Message Posted: Oct 13, 2013 8:51:12 AM

I knew it had something to do with pressure and that little tube in the nozzle, ut always knew there had to be more to it than that.
SUNOIL
Champion Author Toledo

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Message Posted: Oct 13, 2013 8:39:26 AM

And now you know the rest of the story
mdr46
Veteran Author Maryland

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Message Posted: Oct 13, 2013 8:17:08 AM

Interesting read.
FPLREP
Champion Author Virginia

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Message Posted: Oct 13, 2013 7:39:01 AM

And sometimes they don't work as you watch a puddle form at your feet.
boileauj
All-Star Author Spokane

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Message Posted: Oct 13, 2013 4:16:53 AM

Great piece of tech to know about. Not surprising how they can easily malfunction.
eyegotgas2
Champion Author British Columbia

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Message Posted: Oct 13, 2013 3:25:50 AM

Really doesn't matter to me as long as it works. I have noticed some pumps are faster than others which could trigger a shut off faster than a slow filling gas pump.

Still not sure on that one.
MichaelJFS
Veteran Author Wisconsin

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Message Posted: Oct 13, 2013 2:39:54 AM

You learn something new every day,,, if you're not careful.

:o)
cnygas
Champion Author New York

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Message Posted: Oct 13, 2013 1:53:24 AM

Most stations around here have that latched removed, you can hold down the pump but you can't latch it. It still shuts off but you can't walk away.
cnygas
Champion Author New York

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Message Posted: Oct 13, 2013 1:51:55 AM

Different then I thought
silverfoxv65
Champion Author Michigan

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Message Posted: Oct 13, 2013 1:17:16 AM

Kinda sounds like a democratic GOV.
silverfoxv65
Champion Author Michigan

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Message Posted: Oct 13, 2013 1:16:05 AM

I am with you mpg611, just learned something new.

[Edited by: silverfoxv65 at 10/13/2013 1:16:23 AM EST]
LostInNY
Champion Author New York

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Message Posted: Oct 13, 2013 1:07:39 AM

Of course there's probably a better, smarter way to prevent spills from happeing.
mpg611
Champion Author Cleveland

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Message Posted: Oct 13, 2013 12:30:14 AM

Learn something new everyday.
CivicMA
Champion Author Boston

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Message Posted: Oct 13, 2013 12:28:22 AM

Very interesting.
BEGTWO
Champion Author Maryland

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Message Posted: Oct 13, 2013 12:23:31 AM

COOL
1momsunshine
Champion Author Ottawa

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Message Posted: Oct 13, 2013 12:20:03 AM

Very interesting.
mlmeng
Champion Author Michigan

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Message Posted: Oct 13, 2013 12:16:33 AM

I've heard this explanation before but the refresher is good.
doeslayersr
Champion Author Illinois

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Message Posted: Oct 13, 2013 12:04:30 AM

Complex to the vacuum and air filled minds.
lin95688
Champion Author California

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Message Posted: Oct 12, 2013 11:00:15 PM

well, I know something is going on in there.
alterman156
Champion Author New York

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Message Posted: Oct 12, 2013 10:48:50 PM

I learned about this on another website.
Tekkersmom57
Champion Author Syracuse

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Message Posted: Oct 12, 2013 10:46:35 PM

I had never given it a thought, but now I know!
davenles
Champion Author Texas

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Message Posted: Oct 12, 2013 10:44:24 PM

Very interesting.
Claruth
Rookie Author Texas

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Message Posted: Oct 12, 2013 10:17:00 PM

very interesting to know how most things work.
Previvor
All-Star Author Virginia

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Message Posted: Oct 12, 2013 10:09:58 PM

Interesting
roadrunnin
Champion Author Richmond

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Message Posted: Oct 12, 2013 9:58:42 PM

interesting how people come up with these inventions
Yooperheart
Champion Author Michigan

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Message Posted: Oct 12, 2013 9:56:03 PM

And now back to reality, when will the pump prices stabilize now that the U.S. is a major player in the Export business?
esq262
Champion Author Asheville

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Message Posted: Oct 12, 2013 9:52:12 PM

Interesting.
gta_guy
Champion Author Toronto

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Message Posted: Oct 12, 2013 8:59:57 PM

Good to know
Straitliner
Champion Author Illinois

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Message Posted: Oct 12, 2013 8:36:32 PM

I wont lose any sleep tonight now that I know this. None the less thanks.
drpepperTX
Champion Author Texas

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Message Posted: Oct 12, 2013 7:04:41 PM

Surprisingly simple actually.
00MrSlate00
Champion Author Illinois

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Message Posted: Oct 12, 2013 7:01:10 PM

WOW
djwhit
Champion Author Ohio

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Message Posted: Oct 12, 2013 6:53:59 PM

STOP BEING DUMB..../.......
humblepie
Champion Author Toledo

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Message Posted: Oct 12, 2013 6:37:36 PM

nope, i couldnt care less
doggod
Champion Author Anchorage

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Message Posted: Oct 12, 2013 6:25:44 PM

All I know is I can put in another 5 gallons in my motor home after the first click. I know, I know, I'm a bad person and I'm going to heck. Or so I'm forced to say on this board.

You know the definition of "heck", right? It's the place where people are darned to go if they don't believe in gosh or trust in geez.

c0wb0y
Champion Author Denver

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Message Posted: Oct 12, 2013 6:16:54 PM

Interesting.
madison8359
Champion Author Cleveland

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Message Posted: Oct 12, 2013 6:06:38 PM

Seems simple to me.

Thanks for the information.
MrLefty0706
Champion Author Chicago

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Message Posted: Oct 12, 2013 5:54:35 PM

Interesting posting.
wrunner
Champion Author Virginia

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Message Posted: Oct 12, 2013 5:40:56 PM

Fascinating.

Complicated it maybe, but simple to operate.

tnfran
Champion Author Arizona

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Message Posted: Oct 12, 2013 5:24:09 PM

Ok, thanks for the info.
txequitygas
Champion Author Houston

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Message Posted: Oct 12, 2013 5:17:39 PM

good to know, I will look for the hole next time.
moose21040
Veteran Author Baltimore

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Message Posted: Oct 12, 2013 5:08:21 PM

thanks
dunesfly
Champion Author Cape Coral

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Message Posted: Oct 12, 2013 4:53:36 PM

It takes way too long to shut off on my truck.
flatrock14
Champion Author Michigan

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Message Posted: Oct 12, 2013 4:40:16 PM

i'm just glad it shuts off
VanIsleRover
Champion Author British Columbia

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Message Posted: Oct 12, 2013 4:07:37 PM

Thanks for this article.
PathfinderSC
Champion Author South Carolina

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Message Posted: Oct 12, 2013 3:59:49 PM

Good Article.
bwatchingu
Champion Author Arkansas

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Message Posted: Oct 12, 2013 3:56:22 PM

Interesting
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