Fuel Level Question
10-30-2013, 10:17 AM
#1
Instructor
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Location: Pearland TX
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Fuel Level Question
Got a question. I have had the Vette now for 6 months. When fueling the car when the pump clicks off the car is full. I mean if you try and round up like my OCD self wants to do to make an even dollar amount, you cant the fuel will spill out. Do all C6 vettes do this?
This is not a complaint or any reason to worry just a true question.
This is not a complaint or any reason to worry just a true question.
10-30-2013, 10:25 AM
#2
Melting Slicks
Yep....In my experience....stop when it clicks off...you're full! That is unless you enjoy wiping gas off the side of the car when it spills out.
I do also notice that I sometimes get a click off about half way, and sometimes have to hold the filler at a weird angle and manually squeeze the last half. My theory is that it has something to do with the two tanks and transfer of fuel between them (i.e. you're filling the tank faster than the transfer between the two tanks can occur, so one gets "full" and triggers the fuel pump to stop...the pause may be just enough to allow the tank-to-tank transfer to catch up)...but I'm sure somebody will have a better explanation.
I do also notice that I sometimes get a click off about half way, and sometimes have to hold the filler at a weird angle and manually squeeze the last half. My theory is that it has something to do with the two tanks and transfer of fuel between them (i.e. you're filling the tank faster than the transfer between the two tanks can occur, so one gets "full" and triggers the fuel pump to stop...the pause may be just enough to allow the tank-to-tank transfer to catch up)...but I'm sure somebody will have a better explanation.
Last edited by DigitalWidgets; 10-30-2013 at 10:28 AM.
10-30-2013, 12:14 PM
#6
Instructor
Yep....In my experience....stop when it clicks off...you're full! That is unless you enjoy wiping gas off the side of the car when it spills out.
I do also notice that I sometimes get a click off about half way, and sometimes have to hold the filler at a weird angle and manually squeeze the last half. My theory is that it has something to do with the two tanks and transfer of fuel between them (i.e. you're filling the tank faster than the transfer between the two tanks can occur, so one gets "full" and triggers the fuel pump to stop...the pause may be just enough to allow the tank-to-tank transfer to catch up)...but I'm sure somebody will have a better explanation.
I do also notice that I sometimes get a click off about half way, and sometimes have to hold the filler at a weird angle and manually squeeze the last half. My theory is that it has something to do with the two tanks and transfer of fuel between them (i.e. you're filling the tank faster than the transfer between the two tanks can occur, so one gets "full" and triggers the fuel pump to stop...the pause may be just enough to allow the tank-to-tank transfer to catch up)...but I'm sure somebody will have a better explanation.
10-30-2013, 12:30 PM
#7
Drifting
Gravity definetly takes over on the fuel guage needle. I have always rounded off while fueling. Not in this car. I also turn the nozzle 180 degrees and it fills without cutting off. Here is the tank set up.
Last edited by spdkilz911; 10-30-2013 at 12:32 PM.
10-30-2013, 12:37 PM
#8
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10-30-2013, 01:29 PM
#10
Team Owner
Mine is that way. The first time I filled it on the way home from buying it, I got gas all over the fender from just clicking it once. It will not take one extra cup of gas after the pump stops.
10-30-2013, 02:15 PM
#12
Le Mans Master
Other C6s (like mine), in conjunction with certain vapor-recovery systems (like the ones around here), start clicking off intermittently after the spillover to the second tank, making refueling a bit of a chore.
I think you need a more worthy compulsion. Rounding to an integer dollar figure - what's the significance of that? Surely it's far more elegant to see that the car is completely refueled.
10-30-2013, 03:08 PM
#13
Tech Contributor
I want my click back 
10-30-2013, 04:07 PM
#14
Burning Brakes
So….I already knew about the two tanks set-up from reading this forum, but as a Vette newb, I'd like to understand a little more clearly how the system works.
1) The smaller left tank is the driver's side tank that fills from the pump?
2) The large cross-over hose fills the right side tank when the left tank becomes full during the filling?
3) How do the two tanks empty as fuel is used during driving? From both tanks simultaneously? From the left tank with continuous gravity feed from the right tank? Actively pumped from the right tank?
4) How is the fuel gauge measurement calibrated? As an average from both tank sensors? Calculated "amount remaining" as a function of fuel-flow-over-time vs total fuel capacity?
Seems awfully complex for what should be a straightforward system….
Inquiring minds want to know.
1) The smaller left tank is the driver's side tank that fills from the pump?
2) The large cross-over hose fills the right side tank when the left tank becomes full during the filling?
3) How do the two tanks empty as fuel is used during driving? From both tanks simultaneously? From the left tank with continuous gravity feed from the right tank? Actively pumped from the right tank?
4) How is the fuel gauge measurement calibrated? As an average from both tank sensors? Calculated "amount remaining" as a function of fuel-flow-over-time vs total fuel capacity?
Seems awfully complex for what should be a straightforward system….
Inquiring minds want to know.
Last edited by icntdrv55; 10-30-2013 at 04:11 PM.
10-30-2013, 04:08 PM
#15
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When mine clicks off for being full, it's full. Could maybe put a few more cents in, but that's it. I do have it click off while filling if I don't hold the nozzle slightly up so that it is straight in vs. being tilted upward in the fill tube.
10-30-2013, 04:26 PM
#16
Check out the PDF in this post from CO Lightfoot.
http://forums.corvetteforum.com/1583752051-post2.html
http://forums.corvetteforum.com/1583752051-post2.html
So….I already knew about the two tanks set-up from reading this forum, but as a Vette newb, I'd like to understand a little more clearly how the system works.
1) The smaller left tank is the driver's side tank that fills from the pump?
2) The large cross-over hose fills the right side tank when the left tank becomes full during the filling?
3) How do the two tanks empty as fuel is used during driving? From both tanks simultaneously? From the left tank with continuous gravity feed from the right tank? Actively pumped from the right tank?
4) How is the fuel gauge measurement calibrated? As an average from both tank sensors? Calculated "amount remaining" as a function of fuel-flow-over-time vs total fuel capacity?
Seems awfully complex for what should be a straightforward system….
Inquiring minds want to know.
1) The smaller left tank is the driver's side tank that fills from the pump?
2) The large cross-over hose fills the right side tank when the left tank becomes full during the filling?
3) How do the two tanks empty as fuel is used during driving? From both tanks simultaneously? From the left tank with continuous gravity feed from the right tank? Actively pumped from the right tank?
4) How is the fuel gauge measurement calibrated? As an average from both tank sensors? Calculated "amount remaining" as a function of fuel-flow-over-time vs total fuel capacity?
Seems awfully complex for what should be a straightforward system….
Inquiring minds want to know.
10-30-2013, 05:18 PM
#18
Melting Slicks
10-30-2013, 05:52 PM
#19
Burning Brakes
richsteele: Thanks for that primer on the fuel system. All I can say is "WOW!"….and wonder how many GM engineers it took to design a system that would do the Space Shuttle proud. I sure as hell hope that, over the lifetime of the vehicle, it is as reliable as it is complicated. 
What's seems odd to me is that the two-tank set-up (vs a large single tank) would be beneficial to vehicle dynamics as result of better weight distribution, but that is obviously negated by the fact the system draws from the left tank, which stays 100% full until the right tank is completely emptied.
What's seems odd to me is that the two-tank set-up (vs a large single tank) would be beneficial to vehicle dynamics as result of better weight distribution, but that is obviously negated by the fact the system draws from the left tank, which stays 100% full until the right tank is completely emptied.
