Toyota of Lewisville Helpful Tips: How does your gas gauge really work?
Posted by ajones | Posted in Toyota Of Lewisville, Toyota of Lewisville Tips | Posted on 24-02-2011
Tags: bumping the gas pump, gas gauge calibration, gas tank reserve, how does a gas gauge work, long fill neck reserve, Rene Isip, topping of the tank, Toyota Dallas, toyota of lewisville
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The gas gauge in your car can fool you. It stays on full a long time, and then suddenly drops to half, and then again takes a long time to reach empty, and why does that light come on when it does?
We have the answers to these questions and more because we at Toyota of Lewisville drive these cars everyday too. Let’s take a look and see why it does what it does.
“The customer told us that’s what they wanted it that way,” the engineers tell us.
“What?” we said.
Yep, we checked with our Service Shop guys and it’s true. The factories do all kinds of “focus group studies” where they have people drive test cars and then get feedback.
They said, “It made it seem like they were getting better gas mileage”.
Well, OK then, why does the beep and light come on so early?
Customer said, “We want a reserve, but not too much reserve”.
Maybe the best way to explain it is in good old common terms, not engineering jargon.
- Gas tanks are funny shapes, and they can have long fill necks
- That funny shape does not allow “consistent” usage to record on a gauge
- An uneven bottom may have more gas down low
- Adding multiple “check points” would add cost to building the car
i. Park on a hill with half-a-tank and it shows full
ii. Drive long incline hills and the gauge reads wrong
iii. Air pressure can effect “rubber collapsible” tanks
- Gas tanks hold liquid that sloshes back and forth when you turn corners.
- Calibration tries to accommodate this condition, but it’s hard.
- Long fill necks cause the gauge to be ‘calibrated’ for extra gas
- All fuel pumps do not deliver exactly the same “tenths” of gallons
- Some people keep “bumping” the gas pump handle to get the last drop
- All of this is hard to calibrate for exactly, so it varies.
- If you have more questions, that’s great. Go to “taking care of your Toyota”.
Gauges of the future
We would like to say that someday a gas gauge will show exactly how much gas is actually in your tank and how many miles to empty; but, people are people and sometimes they want the gas gauge to tell them what they want to hear. The factory engineers have taken all this into consideration and done the best they could. If you seldom, or never, run out of gas; they have done a good job.
We think the gas gauge in new cars will always have a little personality




