Have the fuel gauge checked also.
Wont run
Thread Starter
Heel & Toe
Joined: Jul 2009
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Wont run
I ran my c6 til the low fuel lite came on. One mile later it died. Barely got it restarted and limped to a gas station and refueld with high octane. Only took 15.5 gal so it wasn''t empty. Has not run good since. Wont idle until you run it at 1500 rpm and slowly let it down, starts only with a little press of the gas peddle, still idles bad. I've disconnected the battery to reset the computer. Could the last 3 gals have been contaminated or worse?
Le Mans Master
Joined: Feb 2008
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From: Lake Worth Beach, Florida
All the gas would have been contaminated if any of it was contaminated. Wonder if you have a fuel pump problem. The fuel pump resides in the gas tank. Have the fuel line pressure checked.
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From: Houston TX
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15- '16-'17-‘18-‘19-'20-'21
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My money is on the fuel pump. Same thing on the wife's car after she kept running on fumes. 
Cost an arm and a leg to get it fixed.
Cost an arm and a leg to get it fixed.
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15- '16-'17-‘18-‘19-'20-'21
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'case his fuel mileage sucks ......................... 
Thread Starter
Heel & Toe
Joined: Jul 2009
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Codes showed multiple cyl. misfires. Added a can of HEET last night, ran better today but still misfiring, not as bad. After extnsive research on how these tanks work I found threre are two tanks, 9 gal drivers side and 9 gal pass side. Drivers side is the main. It draws gas from tank two and keeps them fairly equal. My theory is the low fuel light came on (3 gal left, 1.5 in each tank)and the drivers (main) tank drew what gas was left in pass side tank. The pass side has water in bottom it was drawn to the main tank hence causing water to get to the engine.. Fill up only took 15.5 gal so there was 2.5 in the tanks when problem started.
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Continued HEET treatments can evporate that water, get you up & running without a major repair -- with a little luck.
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15- '16-'17-‘18-‘19-'20-'21
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Sound like the o/p needs to find a way to pick the car up and shake it reeel good until all the water comes out of the tanks ............... 
Pro
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C6 of Year Finalist (performance mods) 2019
I get the low fuel warning real often. Maybe mine survives because I never give water a chance to build up. The gas doesn't stay in the tank very long either when driven often.
Le Mans Master
Joined: Aug 2009
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From: Bucks Co. / outside Philadelphia PA
I ran my c6 til the low fuel lite came on. One mile later it died. Barely got it restarted and limped to a gas station and refueld with high octane. Only took 15.5 gal so it wasn''t empty. Has not run good since. Wont idle until you run it at 1500 rpm and slowly let it down, starts only with a little press of the gas peddle, still idles bad. I've disconnected the battery to reset the computer. Could the last 3 gals have been contaminated or worse?
It shut off while it still had gas. So you didn't run out, causing it to stop. Something else went wrong.
As noted, you likely overheated your pump and messed it up. A weak pump may be causing low fuel pressure. This could be your hard start and idle. The car is expecting more fuel then the pump is delivering and running lean.
Lean is bad. Lean will do bad things to your engine.
Heel & Toe
Joined: Jan 2012
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From: Covington Louisiana
I ran my c6 til the low fuel lite came on. One mile later it died. Barely got it restarted and limped to a gas station and refueld with high octane. Only took 15.5 gal so it wasn''t empty. Has not run good since. Wont idle until you run it at 1500 rpm and slowly let it down, starts only with a little press of the gas peddle, still idles bad. I've disconnected the battery to reset the computer. Could the last 3 gals have been contaminated or worse?
Le Mans Master
Joined: Feb 2007
Posts: 8,514
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From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
Codes showed multiple cyl. misfires. Added a can of HEET last night, ran better today but still misfiring, not as bad. After extnsive research on how these tanks work I found threre are two tanks, 9 gal drivers side and 9 gal pass side. Drivers side is the main. It draws gas from tank two and keeps them fairly equal. My theory is the low fuel light came on (3 gal left, 1.5 in each tank)and the drivers (main) tank drew what gas was left in pass side tank. The pass side has water in bottom it was drawn to the main tank hence causing water to get to the engine.. Fill up only took 15.5 gal so there was 2.5 in the tanks when problem started.
The left tank is also sucking right off the bottom although in a well. It is very doubtful that any contamination in the tanks suddenly decided to move when you got to the DIC warning. The DIC warning is set at a safe level. 15.5 gallons is not out of line. Lots of people regularly go to the warning. You still had 2.5 gallons over the pump when you stopped. That should be plenty to keep the pump cool unless the pump was already weak.
If you get water in either tank that is the first thing that the pump sends to the engine. But, thinking outside the box, what if you had something floating in the left tank. It would never get to the pump until you get low on fuel. Because of the way the overflow fills the right tank, large floating debris would eventually all end up in the right tank but small or recently introduces stuff might be able to get back to the fuel pump in the left.
The proof that it was the pump or the fuel would be in measuring fuel pressure/flow and looking at the fuel being pumped.