Donating Fuel upon Full Tank? How true is this?

[jcRN]

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VERY IMPORTANT MUST SHARE THIS.........

Do not Pump Full Tank of Petrol.......

READ THE REASONS -- DO NOT DONATE FUEL
Recently I came across a very useful tip. I was surprised to know it but had a doubt so I talked to one of the pump technicians and he too accepted it as a fact. I think apart from providing space for the gas generated inside the petrol tank this is yet another reason why we shouldn't fill the tank to the brim. Many of us are not aware that the petrol kiosk pump has a return pipe-line (in Pink). 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 pump station) to allow excess petrol to flow back into the pump. But the return petrol has already pass through the meter, meaning you are donating the petrol back to the Oil Dealer.

Also only fill up your car or truck in the early morning when the ground temperature is still cold. Remember that all service stations have their storage tanks buried below ground. The colder the ground the more dense the petrol, when it gets warmer petrol expands, so buying in the afternoon or in the evening....your liter is not exactly a liter. In the petroleum business, the specific gravity and the temperature of the petrol, diesel and jet fuel, ethanol and other petroleum products plays an important role.

A 1-degree rise in temperature is a big deal for this business. But the service stations do not have temperature compensation at the pumps.

When you're filling up do not squeeze the trigger of the nozzle to a fast mode If you look you will see that the trigger has three (3) stages: low, middle, and high. You should be pumping on low mode, thereby minimizing the vapours that are created while you are pumping. All hoses at the pump have a vapour return. If you are pumping on the fast rate, some of the liquid that goes to your tank becomes vapour. Those vapours are being sucked up and back into the underground storage tank so you're getting less worth for your money.

One of the most important tips is to fill up when your Petrol tank is HALF FULL. The reason for this is the more Petrol you have in your tank the less air occupying its empty space. petrol evaporates faster than you can imagine. petrol storage tanks have an internal floating roof. This roof serves as zero clearance between the Petrol and the atmosphere, so it minimizes the evaporation. Unlike service stations, here where I work, every truck that we load is temperature compensated so that every litre is actually the exact amount.

Another reminder, if there is a petrol truck pumping into the storage tanks when you stop to buy Petrol, DO NOT fill up; most likely the petrol is being stirred up as the Petrol is being delivered, and you might pick up some of the dirt that normally settles on the bottom.

To have an impact, we need to reach literally millions of Petrol buyers. It's really simple to do.

I'm sending this note to about thirty people. If each of you send it to at least ten more (30 x 10 = 300)...and those 300 send it to at least ten more (300 x 10 = 3,000) and so on, by the time the message reaches the sixth generation of people, we will have reached over Three MILLION consumers !!!!!!! If those three million get excited and pass this on to ten friends each, then 30 million people will have been contacted!

If It goes one level further, you guessed it..... THREE HUNDRED MILLION PEOPLE!!!

Again, all you have to do is send this to 10 people. How long would it take?

is this true? full tank pa naman ako lagi pag nagpapakarga.

[_Cathy_]

I don't let my tank go below 1/2. I get a full tank every week whether it reaches 1/2 or not. Automatic lang ako and I fill up in the afternoon/night when the weather is a bit cool.

[Excalibur]

is this true? full tank pa naman ako lagi pag nagpapakarga.

Ako din pa full tank lagi when the bar or light in the fuel guage starts blinking. Saves time and effort in comparison nung pa P500 or less worth pakarga every now and then.

[renzo_d10]

if it's about the air, just tell the gas boy "puro" or "uno" lang

will take you longer when you gas up but the lesser air there will be on your tank

filling gas is like pouring coke on an empty glass

pour coke fast then there will be a bubbles on top making it look full, but when already settled, really isn't

pour coke slowly (uno/puro on fuel) then there will be less to no bubbles on top thus, filling up the whole glass (tank) with coke (fuel)

[Retz]

you could tell the gas boy to lower the speed when you refuel. may speed un eh.

[Walter]

Tell the attendant speed 1 only when filling up.

[Arshxd]

Here's the big question. Will the fuel you "donate" back to the gas station outweigh the fuel you waste stopping for gas because you didn't go full tank.

[dr. d]

anyone knows how much difference in fuel volume with every one degree centigrade difference?

[nivraarvin]

anyone knows how much difference in fuel volume with every one degree centigrade difference?

Gas=.000945
Diesel=.000824

50ml per 60L

[dr. d]

Gas=.000945
Diesel=.000824

50ml per 60L

does that translate to 500 meters extra/less travel per 600 km of travel.. ? not much, but it is there..

[Arshxd]

Tips on Pumping Gas - Urban Legends

According to this 1% per 15 degrees. But because gas is underground it doesn't matter.

[jut703]

I work for an oil company and I find this claim quite misleading, at the very least.

First off, when having your car filled up (i.e. full tank in automatic), what happens is that the pump dispenses fuel into the tank continuously. When the tank is full, the fuel in your tank touches the sensing tube (located at the end of the fuel pump nozzle) which closes a mechanical valve in the nozzle, cutting off fuel supply. Think of it as you filling a bucket with a garden hose - when the bucket is full and the water in it begins to touch the tip of the garden hose, the water supply is automatically cut. Because of this feature, it's very unlikely that you will be "donating" fuel back to the underground tank.

If you're concerned about the fuel left in the hose, this actually isn't counted in your meter so you're really not losing anything that you pay for. If it helps, these fuel dispensers are calibrated several times in a month manually, with very low tolerances for error. So far I've yet to encounter a pump that severely under-dispenses.

Now, onto the topic of vapor reducing the amount of fuel in your tank - to some extent, it's true. When filling up your tank at high speed, it's indeed possible to have bubbles form in your tank (as mentioned, similar to pouring coke too quickly). However, also like a bottle of coke, the air that forms the bubbles doesn't come from the nozzle itself, but from the surrounding air, so you're not "cheated" since all that's being counted is the liquid fuel from the pump. That said, it's important to let the fuel settle down first in your tank when filling up to the brim (sagad, not just automatic) because you get to maximize your tank that way. However, in general I don't recommend filling a tank to its full limit because of the volatile nature of gasoline, which needs a certain ullage (allowance of air) inside the tank.

As for the temperature affecting the amount of fuel filled up - again, this is true but I want to qualify some things. Yes, fuel expands when heated so it's less dense at noon than during a cool night, but keep in mind that fuel is stored underground and are enclosed in very thick steel (or fiberglass) tanks which means that changes in the fuel's temperature aren't as drastic as changes in ambient temp (think of the water in a thermos). I haven't done an empirical test on the actual difference of a full tank at noon and at night, but I'm willing to bet that it's not that huge. I say this because the expansion of fuel from 15º (standard measuring temp) to ambient temperature (25-30º) is very minimal (~1%).

Filling up "uno" and choosing the time of day to fill up can indeed make a difference, but it's so minimal that you're better off adjusting other aspects of your driving if you want to be more frugal. Simply turning your engine off while filling up saves you a few mL of fuel that you'd have wasted idling.