Petrol

[racheltoh]

I received this in email. Hoax? Fact?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, thereis a mechanism to trigger off the pump latch and at the same time areturn-valve is opened (at the top of the pump station) to allow excesspetrol to flow back into the sump. But the return petrol has already passthrough the meter, meaning you are donating the petrol back to SHELL/PETRONAS/ CALTEX/MOBIL..........

 

[vish]

my mum told me this, she heard it from her honda mechanic...the malaysian way to fill up is to continue for a bit after the first cut-off, but to avoid this ''donation'' effect we shouldnt...

 

[enkil]

Yup.. Normally after cutoff i just try to round off the figure.

 

[genius328i]

for the sake of safety as well.....I guess.

 

[astroboy]

I'm not surprised. I would rather donate 30 sen than seeing petrol gushing out of the tank. To be safe or rather "save", don't fill full lor. But by not filling full, the number of trips to the kiosk increases which will result in unnecessary fuel loss, time loss plus even increasing risk of car jack incidents. I'm not complaining..

 

[turbology]

Then you should fill up the car ONLY during evening, when the temperature is at the hottest!
Heat expand... the whole pipeline, including the meter & hoses will at the max, which mean you get more fuel with less money

 

[etquah]

Then you should fill up the car ONLY during evening, when the temperature is at the hottest!
Heat expand... the whole pipeline, including the meter & hoses will at the max, which mean you get more fuel with less money

I thought to fuel in the morning is better. Less evaporation during cool temperature

 

[racheltoh]

Once a sifu told me to fill up when the weather is cool....ie morning or evening ..

 

[Schwepps]

I received this in email. Hoax? Fact?
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 pump 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/PETRONAS/ CALTEX/MOBIL..........

Don't worry Rachel, it's only an urban legend I've seen sections of hardwall hose at oil & gas exhibitions before, including the Goodyear hardwall hoses that Shell pumps use. They're just simple reinforced hoses and don't contain a return hose within them. The next time you fill up, have a look at the transparent section at the top joint - there's no black hose inside. The pumps are fitted with a venturi sensor in the handle and when it senses the nozzle is blocked by petrol, it cuts the flow.

It also doesn't matter what time of day you fill up. The hoses are hardwall and don't expand, and the metering is by electronic encoder. A more important concern is whether the pumps are certified and occasionally checked for accuracy by an independent body such as the Weights and Measures Dept. A -1% variation is a lot of money over time. That's why we tend to pick a brand with a good corporate integrity reputation and good control over their dealer network isn't it? :wink:

 

[elixir]

I received this in email. Hoax? Fact?

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 pump 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/

PETRONAS/ CALTEX/MOBIL..........

What you have read is true but it's not in Malaysia yet.
The system with a return line is actually called Vapour Recovery System.
Even the dispensing nozzle is different.
The main purpose is to suck petrol vapour which is very flamable but not sucking petrol back to the system.

 

[Schwepps]

Good point Elixir. Such systems have been in use in chemical plants and storage tank facilities already, but having wiki-ed it just now, it seems they're starting to be mandated in US gas stations in California, and the UK is considering it. At the point of sale, it seems to be more to prevent ground-level ozone pollution than for safety reasons, another green initiative.

Come to think of it, that may be why some people here may think there's a vapour recovery system in our pumps! They may have seen the venturi vent hole in the nozzle for the stop-flow pressure sensing system and mistaken that as the hole for the return pipe! Here's a diagram of the nozzle and how it works: http://www.wonderquest.com/sleeping-birds-gas-nozzles-cold-hospitals.htm