Missing Fuel
This may or may not be related to my P0172 System Too Rich.
But even if it is, it shouldn't have happened this way... Or am
I missing something other then 3 gallons of gasoline?
This is going to require a little bit of math.

I toped off my tank with Shell 93 Octane gasoline. (enriched? or diluted? with Nitrogen)
I then drove 291.3 miles.
The dash said that I had an average fuel economy of 39 mpg.
I then filled my tank up with Cheveron 93 Octane gasoline.
It took 10.83 Gallons.
Now when *I* do the math on this,
I get an average fuel economy of 26.89 mpg.
According to the mpg reported by my car,
I should have only been able to fill up
with 7.47 Gallons of gasoline. Because
that's all that should have been used if
the 39 was correct.
So, where did this 3.36 gallons of gasoline go?
I seriously doubt that some one is going to siphen
and steal only 3 gallons if I was robbed. If
Im running rich, and the computer knows it,
it should have effected the reported fuel economy
output so the numbers should still come out correctly.
I Mean this is an error of 31.06% !
That is a very significant ammount to be off.
So, what gives? Any ideas?
-Jonathan

 

your dic lied

 

Computers don't lie of their own motivation.
They either report innacurate data due to
innacurate inputs? Or they report innacurate
data due to being programed that way.
Either way, there should be (hopefully)
a way to calibrate this somehow?
So that it either gets accurate data? or
Give it adjsuted innacurate data so that
when it tries to lie in accordance with
its program that it instead tells the truth.
-Jonathan?

 

what are your mods?

 

are you stock? what are your mods? yeah the dic is not all that accurate. it is usually closer then that though

 

I dont know the intervals that the DIC resets its self if it even does. I also don't know how many samples it takes to come up with the number it does and how quickly. If you don't touch the reset its averaging a lot more than just your trip. If you romp on it, then go on a 1000 mile highway trip, the DIC (afaik) will not give you true highway mileage, it will have remembed you romping the **** outta the car and factor that in.

Don't use the DIC as IMO it does not give us a statistic that we find useful I think (although many people have claimed to be within a few mpg-/+. Use the trip meter and good old long division because that will be correct.

 

i have the SAME problem. i am on LOW and i fill up completely and it's like 11 gallons at most i never see it fill 13 gallons.

 

the gauge is calibrated to 11. then you have your reserve. that way it helps you not run out of gas. that is normal

 

I have a KN Intake and filter.
I have a engine stabalisor installed
to prevent engine rocking. The SC
Pullly may be slightly undersized.
I have better shocks and struts.
these modifications were all done
prior to me buying the car used
from a Chevy Dealership.
Also
When I top off fuel, I reset the fuel econ and the trip meter.
So my division numbers should match up fairly close to the
econ number.
-Jonathan

 

hmmm not sure then. i dont know what the dic uses to calculate fuel econ.

 

oh ok so even though it says i'm low i really got like 2 gallons in a reserve tank??

 

The only way youll fill up to 13 is if your COMPLETLY EMPTY.
Aperently LOW is on at 2 gallons left. Your putting gas in when
you have 2 gallons left in the tank. If you compeltly run your
car out. And tow it to a gas station, I bet you'll put in 13.

 

does it ever smell like fuel under the hood? ive noticed some people dont know how to install injectors correctly.. a lot of time they pinch/cut the o-rings and fuel drips out...

 

exactly, its not a separate tank, its the same tank. but yeah it is a little bit of a safety barrier

 

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