Cheapest Petrol & Diesel Discussion Area

ChemicalJasper

Crabman wrote: »

The way most pumps work is by having a second small nozzle which sucks out of the tank - when it senses fluid instead of air it cuts-off. Therefore, every time you feel it clunk, you're losing a little.

Not in the UK - Have you actually ever looked down the nozzle at the petrol pump? - Do so and let me know where this extra nozzle is!

The clunk is a simple back pressure device which stops the flow as the back pressure increases when liquid covers the end of the nozzle, but it certainly does not suck any gas back out of your tank!

shinydoc

ChemicalJasper wrote: »

Not in the UK - Have you actually ever looked down the nozzle at the petrol pump? - Do so and let me know where this extra nozzle is!

The clunk is a simple back pressure device which stops the flow as the back pressure increases when liquid covers the end of the nozzle, but it certainly does not suck any gas back out of your tank!

Not sure that is true Jasper, do look in the end and you will see a another very small tube manufactured as part of the main nozzle. I believe that this is used to recover some of the vapour too.

Crabman

ChemicalJasper wrote: »

Not in the UK - Have you actually ever looked down the nozzle at the petrol pump? - Do so and let me know where this extra nozzle is!

The clunk is a simple back pressure device which stops the flow as the back pressure increases when liquid covers the end of the nozzle, but it certainly does not suck any gas back out of your tank!

I have looked in the past (when I first heard about it) and there was indeed a smaller nozzle for sensing fuel levels. Someone I know thinks it's some kind of porthole to a parallel universe but I don't think so

ChemicalJasper

shinydoc wrote: »

Not sure that is true Jasper, do look in the end and you will see a another very small tube manufactured as part of the main nozzle. I believe that this is used to recover some of the vapour too.

A poorly worded response perhaps,:o partly borne out of frustration at some of the urban tales that I have seen on here, which are not helpful to the moneysaving crew!

Yes, there is a small pipe, usually along the bottom of the filler nozzle, this is part of the safety cutoff / the pressure device that I mentioned - What I was trying to get at was that there is no separate nozzle that robs fuel back out of your tank and returns it to the pump.

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 within the handle. When the tank is not full, air and vapour is being drawn through the hole by the vacuum (and returned back down the filler nozzle with the gasoline to your car tank), 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. - like 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 is used to flip a lever that cuts off the nozzle.

DO YOU SHAKE?

Next time you fill up, make sure you shake the nozzle, to ensure you get the last few tea spoons worth out - many people do not!

shinydoc

ChemicalJasper wrote: »

A poorly worded response perhaps,:o partly borne out of frustration at some of the urban tales that I have seen on here, which are not helpful to the moneysaving crew!

Yes, there is a small pipe, usually along the bottom of the filler nozzle, this is part of the safety cutoff / the pressure device that I mentioned - What I was trying to get at was that there is no separate nozzle that robs fuel back out of your tank and returns it to the pump.

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 within the handle. When the tank is not full, air and vapour is being drawn through the hole by the vacuum (and returned back down the filler nozzle with the gasoline to your car tank), 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. - like 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 is used to flip a lever that cuts off the nozzle.

DO YOU SHAKE?

Next time you fill up, make sure you shake the nozzle, to ensure you get the last few tea spoons worth out - many people do not!

Yes, I always let the last little bit drain out of the nozzle when I have finished AND if you keep filling VERY slowly, at some point you will notice you can get an extra 0.01 of a litre without the price increasing at all! :money: (This is due to the rounding error in the price calculation)

ChemicalJasper

shinydoc wrote: »

Yes, I always let the last little bit drain out of the nozzle when I have finished AND if you keep filling VERY slowly, at some point you will notice you can get an extra 0.01 of a litre without the price increasing at all! :money: (This is due to the rounding error in the price calculation)

Very Good Point:beer: Also my local Sainsburys keeps a pile of 1p's on the counter for if you are paying with cash and have just gone over - if you are careful you can go over by 1p every time!.....and in 40 years time.......

But DO NOT pick up the loop of the hose on the floor and raise it above the nozzle. The amount of people I see doing that locally.:rolleyes: :rotfl:

I guess some people dont understand that the valve is in the trigger and they see one person doing it and think " der that looks a good idea".

shinydoc

ChemicalJasper wrote: »

Very Good Point:beer: Also my local Sainsburys keeps a pile of 1p's on the counter for if you are paying with cash and have just gone over - if you are careful you can go over by 1p every time!.....and in 40 years time.......

But DO NOT pick up the loop of the hose on the floor and raise it above the nozzle. The amount of people I see doing that locally.:rolleyes: :rotfl:

I guess some people dont understand that the valve is in the trigger and they see one person doing it and think " der that looks a good idea".

:rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl::rotfl:

shinydoc

GemmaJaye wrote: »

BaBeeCard gives you access to a discounted shopping portal where you can buy supermarket vouchers at a 5% discount and use them in-store and in their petrol stations.

www.babeecard.com

I notice you say vouchers, rather than just use the card. What is the process of getting the vouchers, how long does it take and are there any associated costs, like postage??

corpse88

ChemicalJasper wrote: »

But DO NOT pick up the loop of the hose on the floor and raise it above the nozzle. The amount of people I see doing that locally.:rolleyes: :rotfl:

I guess some people dont understand that the valve is in the trigger and they see one person doing it and think " der that looks a good idea".

as i work in a petrol station, i see this all the time....people dont believe me when i tell them its no use

GemmaJaye

@ Shinydoc

You buy the card and order the vouchers through the discount portal, they arrive 3 days later by post (no extra cost), you can use them on groceries or petrol at ASDA & Sainsbury's.

It takes a couple of minutes to order the vouchers online, you just add the quantity you want into your shopping basket, check out and they arrive.

You buy them at a discounted rate of 5%