Filling tank with small quantity

[Karoon]

i made this observation when i filled up my car tank with just about 4-5 litres of petrol at a petrol station...

 

(long story... but basically just filled up enough to avoid empty tank so i can get to my preferred petrol provider)

 

the first time i did it, i realised there was no impact whatsoever on my gauge, distance travelled, distance to empty indicator etc... i thought amount put in was too insignificant.

 

second time, again same thing. but it got me thinking... 5L is a significant amount. is it possible that the first few litres is just vapour, no liquid, or a mix of both.... so you get much less than what you think?

[Haziqko]

i've tried filling up 10ltrs & only got me a few bars up, quite insignificant actually. i think its got to do with the shape of the tank + vapor + others. the bigger your tank at the bottom the less your meter go up.

[Agentwilson]

yup, i agree.

 

level sensors dun work so well at very low levels maybe?

might be calibration error

 

[Mingsect]

  On 12/7/2009 at 2:38 AM, Karoon said:

i made this observation when i filled up my car tank with just about 4-5 litres of petrol at a petrol station...

 

(long story... but basically just filled up enough to avoid empty tank so i can get to my preferred petrol provider)

 

the first time i did it, i realised there was no impact whatsoever on my gauge, distance travelled, distance to empty indicator etc... i thought amount put in was too insignificant.

 

second time, again same thing. but it got me thinking... 5L is a significant amount. is it possible that the first few litres is just vapour, no liquid, or a mix of both.... so you get much less than what you think?

 

naye,

if you fill up to a empty fuel container b4.

you will be able to see how many litres u pay is how many liter you pump...

damn accurate..

 

most prob , like most gauge it will need longer time to register the change.

read that most fuel gauge have this device to retard the sensor ,

so that when the vehicle is up or down the slope, the up and down fuel gauge won't scare/panic the driver.

[Zyrofillica]

my car whenever the tank is almost empty (light have not light up), when i drive the 99 bends stretch, every corner the light will light up and then off when the car is straight. think my vehicle petrol sensor is damn bloody accurate

[Adrianli]

What kind of level sensor is installed in the car's petrol tank???

 

 

[Elfenstar]

  On 12/8/2009 at 4:13 AM, Adrianli said:

What kind of level sensor is installed in the car's petrol tank???

 

Usually a floater on a pivot linked to a variable resistance circuit.

 

[Kb27]

It depends on your fuel sensor.

Mine is a float with variable resistance.

At both ends of the float, the reading is not linear.

 

At the low end, it appears whatever you pump will not move the gauge much.

Same thing at the top end, it appears that whatever you use the gauge does not move much.

[Haziqko]

I think the concept is almost simliar to your toilet bowl tank. only the other way round. so if you can shake your toilet bowl tank when its filling up it will stop pumping in water intermitantly. thats why 1 forumer say his signal on-off when the car rolled.