How does a petrol station pump work?

[NA Drifter]

Just got an e-mail today and it make me wonder...

Subject: Do not pump full tank of petrol
Many of us are not aware that the petrol kiosk pump has a return pipe-line
(in black). When the petrol tank (in the car) reaches full level, there is a mechanism to trigger off the pump latch and at the same time a return-valve is opened (at the top of the station) to allow excess petrol to flow back into the sump. But the return petrol has already pass through the meter, meaning you are donating the petrol back to SHELL/ BP/ CALTEX..........

[Ae92typeX]

Quoted from Howstuffworks:
'This mechanism has been around for a long time, so it is safe to say there is not a miniature camera inside the nozzle hooked to a microprocessor. It's purely mechanical -- and ingenious.

Near the tip of the nozzle is a small hole, and a small pipe leads back from the hole into the handle. Suction is applied to this pipe using a venturi. When the tank is not full, air is being drawn through the hole by the vacuum, and the air flows easily. When gasoline in the tank rises high enough to block the hole, a mechanical linkage in the handle senses the change in suction and flips the nozzle off.

Here's a way to think about it -- you've got a small pipe with suction being applied at one end and air flowing through the pipe easily. If you stick the free end of the pipe in a glass of water, much more suction is needed, so a vacuum develops in the middle of the pipe. That vacuum can be used to flip a lever that cuts off the nozzle.

The next time you fill up your tank, look for this hole either on the inside or the outside of the tip. '

an easy way to test what you recieved in an email would be to get a 5l/10l container which has a mark where the 5l/10L level is. place the nozzle right on that or just below and pump untill the auto shutoff is activated (on the level line). The pump should read the correct amount of litres that corresponds to the container. Assuming it does then what the email talks about is compensated for.

[NA Drifter]

[CozmoNz]

and will only happen when fuel is at that level anyway,

its not like your taking 40 litres, and they take 20 litres back....

[Ae92typeX]

It cant return much back if it does, because when a pump clucks off, as soon as you squese the trigger you get instant delivery of fuel again- like instant, so its not like there is a big air block first, as you would suspect would occur to some extent.
I suspect (in a light hearted theory way) that people in general loose more fuel in the bottom loop of the fuel line. most people dont lift the hose over the pump height when they finish putting $5/10/40/70 or filling their tank. You'l find, if you go to a servo with a big mug, you can fill it simply by doing that to the pumps on the forecort...lol, used to do it in the old days.Free petrol!

[CozmoNz]

*will remember to do that*

[Vertigo]

yer, ive been doing that ever since i saw someone do it. great trick, just that little bit extra fuel.

[Malcolm]

here's a tip to remember in future:
never believe anything you recieve via email.
That is all.

[Wildcard]

Hi, my name is Mr Mugarbee from Nigera. I have $12,222,345 dollars in deceased estate money that I am unable to collect in my country. However with your help and your contribution of $20,000NZD I will be able to release these funds and am willing to pay you $7,000,000 of the proceeds. Please transfer the $20,000 into my account to begin this process.

[RomanV]

You have PM

[Adamal]

Hi, my name is Mr Mugarbee from Nigera. I have $12,222,345 dollars in deceased estate money that I am unable to collect in my country. However with your help and your contribution of $20,000NZD I will be able to release these funds and am willing to pay you $7,000,000 of the proceeds. Please transfer the $20,000 into my account to begin this process.

Acc # plz?

[Malcolm]

I bought these pills, and now IM A REAL SEX KING!!!
Girls, queue up now, I feel like f****ng you all

[Adamal]

I bought these pills, and now IM A REAL SEX KING!!!
Girls, queue up now, I feel like f****ng you all

I AM THE SEX KING!!!! I WILL F**K ANYTHING THAT MOVES!!

[Ae92typeX]

haha, what a trash of a topic... some fairly valid points however.
oh-
acc# and a bag of sex king wonder pills please.

[Malcolm]

I just saw something strange on the spam email I quoted above....
the email has a picture of bart simpson having sex with some blonde simpsons-like character, with what I quoted next to it. I've recieved about 10 copies of the bloody thing, but what's interesting is that underneath the picture, in small white text that you can't see is a review of a Harry Potter novel. I have two copies of the email in my deleted items folder, and they both have different reviews on them...weird

"The awful betrayal!" said Katie Oxman, 13, of New Canaan, Connecticut, just minutes after reading the climax. It was so shocking, she said, she screamed out to her father. They had become attached to the characters over the years, worrying and rooting for them during difficult times. What is known is that Rowling has said the books would get progressively darker as Harry -- now entering his sixth year at the Hogwarts School of Witchcraft and Wizardry -- gets older and closer to his ultimate battle with Lord Voldemort, the series' personification of evil. Scholastic, the book's American publisher, is printing a record 10.8 million copies of "Prince." That dwarfs the previous record of 8.5 million copies boasted by the book's predecessor, 2003's "Harry Potter and the Order of the Phoenix." "There's nothing quite like Harry Potter in publishing," Bookseller magazine children's book expert Caroline Horn told Reuters. Ten-year-old Chloe Kaczvinsky picked up her a copy at a midnight bookstore pajama party in Monroe, Louisiana, and finished "Half-Blood Prince" the following afternoon. "It was very dark. And mysterious," she said. But the darkness didn't make it hard to read, and didn't make her cry. What is known is that Rowling has said the books would get progressively darker as Harry -- now entering his sixth year at the Hogwarts School of Witchcraft and Wizardry -- gets older and closer to his ultimate battle with Lord Voldemort, the series' personification of evil. But the books ... well, the books are in no danger of going wanting. "I love his work," she said. "I'm planning on setting up a tent outside the bookstore to get his book." "She (Rowling) manages to make some jokes," she said. "This is a very long mystery novel we are getting in installments," he told USA Today. "Each book ends with some suspense. You want to know what happens next." Those lucky to be at Edinburgh Castle in Scotland are being treated to a reading by Rowling. Fire dancers are expected to perform in the Changing Hands parking lot in Tempe, Arizona, and a New Orleans, Louisiana, bookstore is co-sponsoring a neighborhood Potter adventure, The Associated Press rep What is known is that Rowling has said the books would get progressively darker as Harry -- now entering his sixth year at the Hogwarts School of Witchcraft and Wizardry -- gets older and closer to his ultimate battle with Lord Voldemort, the series' personification of evil. But Potter has been her world since second grade and she doesn't know how to replace it. The Potter movies have let her down, only reminding her of how much she loved the books. She's even thought of writing her own fantasy novel, but, again, Potter gets in the way. "She (Rowling) manages to make some jokes," she said. As usual when it comes to J.K. Rowling's teenage wizard, plot hints are few and rumors are many. Rowling has revealed three chapter titles -- "Spinners End" (Chapter 2), "Draco's Detour" (Chapter 6) and "Felix Felicis" (Chapter 14) -- and has long said that the books will get deadlier as Harry gr

Random.

[method]

Thats just to get around spam filters i think.

[barryogen]

Thats just to get around spam filters i think.

indeed it is, have a look online at how spamassassign works, it is a fairly popular ISP style spam catcher.