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Savings during Petrol Fill-Up.
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<blockquote data-quote="fabianyee" data-source="post: 518686" data-attributes="member: 6"><p>Becareful of what u read in the net... It may or may not have substance or just someone thinking outloud.... </p><p></p><p>Take with a 'spoon' of salt... </p><p></p><p>I for one will pump petrol when it's cool, when possible, not bcos I believed the fuel expands that significantly when it's hot.. more bcos it's more comfortable pumping petrol without the scorching heat from the sun. Oso I feel there's less fume escaping from ur own car's fuel tank due to the foaming inside the tank. </p><p></p><p>As for the nozzle speed, I guess it was quoting the Bernoulli's principle that higher fluid speed will generate a low pressure region which may lead to bubbling... While the principle is correct but how does it explain for the fuel nozzle? where is the region of low pressure in the system? Where does the bubbling happen? </p><p>If u ask me, i'll take the beer pouring technique as analogy... The faster (or rougher) the flow into the glass, the more foam were made due to the churning... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue :p" loading="lazy" data-shortname=":p" /> Pour it smoothly into the glass, and there is less foam... I guess u guys get my drift... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> </p><p></p><p>Pumping half tank is not practical and in the first place, was his theory proven to be true??? </p><p></p><p>And please do not run until the tank is dry before refueling.... Cos your in-tank fuel pump is cooled when it's submerged in the fuel.. And it will heat up unnecessarily when the fuel level is too low... And heat is bad for any motor, it will lead to premature failure. I know the E30 fuel pump has a foam sleeve which soaks up fuel and then the fuel evaporates when it soaks up the heat from the pump, which consequently cools it. In other words, the fuel works as a heat exchanger agent for the pump. </p><p></p><p>And for the 'don't pump when the fuel tank truck is reloading', it may have some truth.. But actually if the station is always full with cars pumping, the tendency for the sediment is actually lesser. Cos the fuel has no time to rest before being pumped up.. hahaha... Also, don't u think the underground tank would have a filter at the pump??? I assumed there is a filter, but whether it is serviced or replaced at a specified interval is another story. </p><p></p><p>Then again, it's just me thinking out loud on the 'tips' provided... I just don't believe everything I read online...</p></blockquote><p></p>
[QUOTE="fabianyee, post: 518686, member: 6"] Becareful of what u read in the net... It may or may not have substance or just someone thinking outloud.... Take with a 'spoon' of salt... I for one will pump petrol when it's cool, when possible, not bcos I believed the fuel expands that significantly when it's hot.. more bcos it's more comfortable pumping petrol without the scorching heat from the sun. Oso I feel there's less fume escaping from ur own car's fuel tank due to the foaming inside the tank. As for the nozzle speed, I guess it was quoting the Bernoulli's principle that higher fluid speed will generate a low pressure region which may lead to bubbling... While the principle is correct but how does it explain for the fuel nozzle? where is the region of low pressure in the system? Where does the bubbling happen? If u ask me, i'll take the beer pouring technique as analogy... The faster (or rougher) the flow into the glass, the more foam were made due to the churning... :p Pour it smoothly into the glass, and there is less foam... I guess u guys get my drift... ;) Pumping half tank is not practical and in the first place, was his theory proven to be true??? And please do not run until the tank is dry before refueling.... Cos your in-tank fuel pump is cooled when it's submerged in the fuel.. And it will heat up unnecessarily when the fuel level is too low... And heat is bad for any motor, it will lead to premature failure. I know the E30 fuel pump has a foam sleeve which soaks up fuel and then the fuel evaporates when it soaks up the heat from the pump, which consequently cools it. In other words, the fuel works as a heat exchanger agent for the pump. And for the 'don't pump when the fuel tank truck is reloading', it may have some truth.. But actually if the station is always full with cars pumping, the tendency for the sediment is actually lesser. Cos the fuel has no time to rest before being pumped up.. hahaha... Also, don't u think the underground tank would have a filter at the pump??? I assumed there is a filter, but whether it is serviced or replaced at a specified interval is another story. Then again, it's just me thinking out loud on the 'tips' provided... I just don't believe everything I read online... [/QUOTE]
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