2007 Suburban 2500 LS Fuel Tanks?

[JoeII]

I have a 2007 Suburban 2500 LS and everything I read says it has a 39 gallon fuel capacity. Over the last 60K miles, I have proven that to be true. In the last few months, it has been running out of gas with about 4-5 gallons remaining. It will be fine, with the guage just below one-fourth, driving along and the low fuel light comes on and within a minute, it stalls. When I get it to a gas station, I can only put 35 gallons in it.

I had it on a lift recently and it appears to have two fuel tanks. The fuel fill tube splits and one side goes to a coffin sized tank and the other side goes to a smaller tank above the spare.

If I do have two seperate tanks, do I have two fuel pumps? If so, would it make sense that the smaller tank is not getting to the fuel system? It appears so in this picture.


These fuel run-outs have only occurred while towing, with the tow-mode engaged.

Thanks in advance for your help.
Joe

 

[zora]

I really doubt there is a second tank, in all probablity you see the evaporative emissions tank used to separate fumes from gas. You may have a problem with the float in the tank feeding incorrect readings to the computer.

 

[JoeII]

Anyone with knowledge of this fuel system?
It looks like two tanks, pumps, plus the evap canister.
Thanks again,
Joe

 

[zora]

any reason why you just dont ask a GM dealer that question? cannt imagine they would charge for that information, you could even ask the quy at the parts counter.

 

[JoeII]

They do charge for diagnosing a problem.
My experience with dealers is:
"Bring it in, we'll check it out. What is your Visa #?" If they don't find anything, I still pay...
I'm hoping that service techs frequent these boards.
Joe

 

[zora]

this might give you some further insight into your problem, you appear to be correct, duals controlled by the computer.

http://www.justanswer.com/chevy/39cyj-2002-8-1-liter-suburban-dual-fuel-tanks-it.html

 

[mydogsname istablecloth]

I know this is an old post but where did you find that drawing of the frame? Do you know if GM used the GMT800 (1999-2006) suburban 2500 frames under the GMT900 (2007-2014) suburban 2500's? Was the old frame used for the two body generations?

 

[zora]

Frame for 2006 shows no application beyond that year.

Frame & Components for 2006 Chevrolet Suburban 2500 | GMPartsDirect.com

www.gmpartsdirect.com

 

[mydogsname istablecloth]

Frame for 2006 shows no application beyond that year.

Frame & Components for 2006 Chevrolet Suburban 2500 | GMPartsDirect.com

www.gmpartsdirect.com

Thanks, my wife t boned some one and our frame is bent on our 2011 suburban 2500. Know of any resources where I could buy a new one? I didn't see one on GMpartsdirect.com Ive been talking to a frame straightening specialist and from what he's telling me is it might not be fixable from the pictures i sent him. I haven't got the truck back from insurance yet but would like to know if can even buy a new replacement. Ive been calling local salvage yards, but no luck. Not a very popular truck.

 

[zora]

Try car-parts.com