19 gallon fuel tank?

GT Motoring · 12-11-2009, 04:11 PM

Most manufacturers have the light come on when there are at least 50 miles til empty. Usually 2 to 3 gallons.

ChrisSlicks · 12-11-2009, 04:49 PM

There are few issues at play here. 1 is the actual value that the sender is putting out, 2 is the averaged value that the ECU is interpreting it to, and 3 is the dumbed down version that it decides to show you.

You can't see the value for 1 unless you intercept the voltage from the sender unit, but you can watch the value for 2 using an OBDII reader. The value changes significantly depending on how you are driving, and will creep up while you are stationary. The value for 3 seems to never go up unless you turn off the car, in which case it will reset to the value it gets from step 2.

As far as running out of fuel goes, you can drive down to the last drop if you drive like an old lady and avoid hills, but due to the tank design you in reality need a buffer of at least 3 gallons for average driving and 10 gallons for aggressive driving. The car seems to be calibrated so that it will read empty (no lights, 0 mile range) when you have approximately 2-3 gallons left in the tank.

12-11-2009, 04:11 PM	#1 (permalink)
GT Motoring Enthusiast Member Join Date: Nov 2008 Location: Chicago Burbs Posts: 489 Drives: R35 Rep Power: 841	Most manufacturers have the light come on when there are at least 50 miles til empty. Usually 2 to 3 gallons. __________________ http://www.gtmotoring.com/images/for...r-nagtroc1.gif Zele Authorized USA Dealer Amuse Authorized Distributor 370Z Purchasing Special through GT Motoring www.gtmotoring.com

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12-11-2009, 04:49 PM	#2 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 655	There are few issues at play here. 1 is the actual value that the sender is putting out, 2 is the averaged value that the ECU is interpreting it to, and 3 is the dumbed down version that it decides to show you. You can't see the value for 1 unless you intercept the voltage from the sender unit, but you can watch the value for 2 using an OBDII reader. The value changes significantly depending on how you are driving, and will creep up while you are stationary. The value for 3 seems to never go up unless you turn off the car, in which case it will reset to the value it gets from step 2. As far as running out of fuel goes, you can drive down to the last drop if you drive like an old lady and avoid hills, but due to the tank design you in reality need a buffer of at least 3 gallons for average driving and 10 gallons for aggressive driving. The car seems to be calibrated so that it will read empty (no lights, 0 mile range) when you have approximately 2-3 gallons left in the tank.