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Fuel tank logic
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CLK
#1 Posted : Tuesday, August 13, 2013 7:20:34 AM
Rank: Member

Joined: 4/1/2009
Posts: 846
So my car displays the number of kilometers i have to go with the fuel i have left in the fuel tank at any one point.
I however noticed something strange, i have the habit of visiting the filling station only when the light shows, so on a full tank it would show 700km to go, by the time the trip shows 350-400km, the fuel gauge shows half, which makes sense, however the remaining half rarely does 200km, meaning i spend more when i have less fuel in the fuel tank which beats the logic since i had assumed that if you are carrying luggage in this case about 70 litres of fuel, the car is heavier hence should spend more and not the other way round.
Could someone explain why this is so.

N/B: This conclusion was arrived at since i use this car Monday to Friday to and from work, same route and same time with little or no stop overs or detours
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harrydre
#2 Posted : Tuesday, August 13, 2013 7:33:00 AM
Rank: Elder

Joined: 7/10/2008
Posts: 9,131
Location: Kanjo
well the gas in the fuel tank acts as a 'coolant' for the tank and slows down the fuel consumption. the lower the gas means more overheating in the tank therefore more fuel consumption and wastage through evaporation etc.

Note also that having your tank over half all the time extends the life of the fuel pump.
i.am.back!!!!
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seppuku
#3 Posted : Tuesday, August 13, 2013 9:04:56 AM
Rank: Veteran

Joined: 5/11/2010
Posts: 918
Another factor may be the accuracy of the measuring instrument.
Learn first to treat your time as you would your money, then treat your money as you do your time.
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Magigi
#4 Posted : Tuesday, August 13, 2013 9:18:25 AM
Rank: Elder

Joined: 3/31/2008
Posts: 7,081
Location: Kenya
how big is the fuel tank...could compare with manual calculation...fill three tank and reset the trip meter and see how that compares with the fuel gadget fitted in your car
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Siringi
#5 Posted : Tuesday, August 13, 2013 9:21:54 AM
Rank: Elder

Joined: 6/8/2013
Posts: 2,517
methinks this thread is misplaced... inafaa kuwa huko Technical /Review

Iko makanika wa grogoni ngara na kadharika
"😖😡KQ makes money for everyone except the shareholder 😏😏 " overheard in Wazua
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Mukiri
#6 Posted : Tuesday, August 13, 2013 9:22:05 AM
Rank: Elder

Joined: 7/11/2012
Posts: 5,222
Impurities in the fuel, and by extension, the tank might make up part of the volume of fuel being read by the gauge. Don't forget to change your fuel filter when servicing.

Proverbs 19:21
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wilyum
#7 Posted : Tuesday, August 13, 2013 9:25:08 AM
Rank: Veteran

Joined: 12/21/2011
Posts: 1,010
NA hii gadget,did it came with your car ama you installed locally?
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McReggae
#8 Posted : Tuesday, August 13, 2013 9:25:21 AM
Rank: Elder

Joined: 6/17/2008
Posts: 23,365
Location: Nairobi
There can be so many factors:
1. Shape of the tank, have seen it, it might be smaller at the bottom yet the gauge is linear.

2. The fuel pump only sucks in liquid and not vapour so as explained up there, room for evaporation is more when the tank is empty.

3. Some gauges are designed to show that FULL is FULL but EMPTY is never EMPTY....this helps you not to run out of fuel.

4. Your fuel gauge is not necessarily an accurate precision instrument!!!!!
..."Wewe ni mtu mdogo sana....na mwenye amekuandika pia ni mtu mdogo sana!".
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Mkimwa
#9 Posted : Tuesday, August 13, 2013 11:02:10 AM
Rank: Member

Joined: 10/26/2008
Posts: 380
Have also noted the same with my car.. The first half tank does about 350-450kms, the second half of the tank does 200-250kms at most.. Same driving style, same driver, same routes..

The shape of fuel tank - surely the manufacturers should consider that when placing the sensors for the fuel gauge.

Why do people think that the fuel gauge is not correct? It shows full when its full, and lights up at exactly same point every time..
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Siringi
#10 Posted : Tuesday, August 13, 2013 11:41:55 AM
Rank: Elder

Joined: 6/8/2013
Posts: 2,517
Agreed try This Fuel Full tank ile mpaka imwagike. Drive Nairobi Mombasa or Kisumu and Vice Versa.

My Experience. 1st leg you arrive with 1/2 tank 350Kms - Oksum citi or 500Kms MSA/Nrb

on return leg dont add fuel... Tank ampty after 200-250kms

my experience is with the car infront... siyui hiyzo zigine


Mkimwa wrote:
Have also noted the same with my car.. The first half tank does about 350-450kms, the second half of the tank does 200-250kms at most.. Same driving style, same driver, same routes..

The shape of fuel tank - surely the manufacturers should consider that when placing the sensors for the fuel gauge.

Why do people think that the fuel gauge is not correct? It shows full when its full, and lights up at exactly same point every time..

"😖😡KQ makes money for everyone except the shareholder 😏😏 " overheard in Wazua
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