The Naked Scientists

The Naked Scientists Forum

Author Topic: What is more economical....a half full tank or a full tank ?  (Read 11829 times)

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
Dear Tankers !!

See my car ?



Nice eh ?....Just need to pass my Sheepy driving test and get myself a booster chair and then I can ewese it.......though...I'll probably just get some mates around and climb on it's roof or something !!

But, should I wish to take it for drive.....would it run more economically with a full tank or a half tank of petrol ?...my reasoning is that a half tank will get me more miles to the gallon because there is less fuel to carry ....am I right ?...if not...why not ?


Tank ewe

Neil
Tank Enquirer
xxxxxxxx

« Last Edit: 10/05/2008 21:10:30 by neilep »


 

lyner

  • Guest
You could have saved this question for tanksgiving day.
And, yes, you are correct!
 

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
You could have saved this question for tanksgiving day.
And, yes, you are correct!

LOL !!

TANK EWE !!! sophiecentaur

..it's been a while since I answered my own question !...I was hoping my reasoning was too simple to actually guess right ! ::)
 

lyner

  • Guest
Well, it makes sense. Lugging around a few kg of anything - be it fuel or Auntie Millie - will not help your fuel consumption.
 

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
Well, it makes sense. Lugging around a few kg of anything - be it fuel or Auntie Millie - will not help your fuel consumption.

Yes indeed...but I was also thinking that there may be a difference (weight dependent)in the way that the gas/petrol is supplied to the engine.....does the weight of the fuel add to the delivery rate too ?


hmmm..not too sure if I have explained myself very well here !!
 

lyner

  • Guest
In the old days, they used 'gravity feed' and a fuel tank situated above the engine. The 'head' of fluid could have had an effect on the mixture/fuel flow in a very crude form of early carburettor. Nowadays they use a pump which supplies the fuel at the correct pressure and it doesn't matter how much fuel you have in the tank. This applies to conventional and fuel injection engines.
Did I  understand you correctly?
 

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
In the old days, they used 'gravity feed' and a fuel tank situated above the engine. The 'head' of fluid could have had an effect on the mixture/fuel flow in a very crude form of early carburettor. Nowadays they use a pump which supplies the fuel at the correct pressure and it doesn't matter how much fuel you have in the tank. This applies to conventional and fuel injection engines.
Did I  understand you correctly?

Yes, yes you did...and you answered me perfectly !! :)

THANK YOU very much !!...I am an educated Sheepy !!
 

Offline Karen W.

  • Naked Science Forum GOD!
  • *******
  • Posts: 31653
  • Thanked: 5 times
  • "come fly with me"
    • View Profile
That was a good question and the answer made perfect since..Yayyyyy! So if I empty out everything in my car including the kitchen sink and the extra seats, then i could get a tad better fuel economy.. Yes??? Does that mean that if me takes off some more weight that I might enjoy some extra money in my pocket at fuel time???
 

lyner

  • Guest
And if you leave the kids behind on your next journey, you can stay sane as well.
 

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
And if you leave the kids behind on your next journey, you can stay sane as well.

Thanks for this reminder.......I still need to leave my four bratskids with Doctorbeaver.....he says he loves kids !!
 

Offline ukmicky

  • Neilep Level Member
  • ******
  • Posts: 3011
    • View Profile
    • http://www.space-talk.com/
What is more economical....a half full tank or a full tank ?
« Reply #10 on: 25/05/2008 15:23:09 »
I think that judging by how quickly the cost of fuel is going up a full tank could be economial ;D
 

Offline Poetic-Justice

  • Jr. Member
  • **
  • Posts: 26
    • View Profile
    • Binary Revolution
What is more economical....a half full tank or a full tank ?
« Reply #11 on: 25/05/2008 16:05:11 »
I think that judging by how quickly the cost of fuel is going up a full tank could be economial ;D
I agree! My mum never shuts up when she has to go and fill up.
 

Offline chris

  • Neilep Level Member
  • ******
  • Posts: 5337
  • Thanked: 65 times
  • The Naked Scientist
    • View Profile
    • The Naked Scientists
What is more economical....a half full tank or a full tank ?
« Reply #12 on: 30/05/2008 18:55:32 »
In the old days, they used 'gravity feed' and a fuel tank situated above the engine. The 'head' of fluid could have had an effect on the mixture/fuel flow in a very crude form of early carburettor. Nowadays they use a pump which supplies the fuel at the correct pressure and it doesn't matter how much fuel you have in the tank. This applies to conventional and fuel injection engines.
Did I  understand you correctly?

The way fuel supply was regulated in these sorts of set-ups was in a float chamber. The carburettor has a sump containing a buoyant float. As fuel fills the cup the float rises until it reaches a threshold level at which, rather like a ballcock, it shuts off the incoming fuel supply.

Fuel is then drawn through the carburettor from the cup during the induction stroke. Most lawn mowers today use the same principle, as do most motorbikes.

Chris
 

lyner

  • Guest
What is more economical....a half full tank or a full tank ?
« Reply #13 on: 31/05/2008 00:31:40 »
The float was made of brass and I had one in which a small hole developed. The mixture got richer and richer as the float began to sink.
 

Offline turnipsock

  • Hero Member
  • *****
  • Posts: 586
  • Beekeeper to the unsuspecting
    • View Profile
What is more economical....a half full tank or a full tank ?
« Reply #14 on: 31/05/2008 01:09:40 »
Since a fuel tank is two pressings welded together they tend to burst around the weld.

My tank leaks if put in more than 30l. In my case it is more economical to run the tank half empty...then i don't have to worry about people throwing out cigarette ends.
 

Offline jin

  • First timers
  • *
  • Posts: 4
    • View Profile
What is more economical....a half full tank or a full tank ?
« Reply #15 on: 03/06/2008 08:31:47 »
nice car dude
F


|
|
|
|
|
E
Is better for this
 

Offline qazibasit

  • Sr. Member
  • ****
  • Posts: 344
    • View Profile
What is more economical....a half full tank or a full tank ?
« Reply #16 on: 14/06/2008 21:15:08 »
well nice car nelip, now i know why u spend so much time on naked scientist forum coz u are a rich guy and u dont need to earn money and own a very nice car. well what i have heard from many mechanical engineers and car repair mechanics is that a car with a full fuel tank consumes less fuel as compared to half tank or almost empty tank. Thats why when there is low fuel in the car it burns more quickly than when there is fuel.
 

The Naked Scientists Forum

What is more economical....a half full tank or a full tank ?
« Reply #16 on: 14/06/2008 21:15:08 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums