JamieB513

Thanks for the replies and info. GM made both the Yukon XL 2500 and the Suburban 2500 with the dual tank setup from the factory (although I'm not sure of the years). It sounds like I'm gong to have to drop the tanks to check the sending units either way, I might go ahead and throw two new pumps in while everything is apart. I'm torn because it's got such low miles and would think the pumps would be good for another 70,000 or so, but on the other hand, they are 16 years old. I was thinking there is a module for the two tanks sending units that combines the ohms readings and then sends that to the gauge, but it sounds like maybe the gauge receives both signals separately and then averages it there. I appreciate the fuel ohms chart as well, that is good info to know when checking everything out. Thanks again for the help, Jamie

Hello, I just bought a 2004 Yukon XL 2500 with the 8.1L engine and 31,000 original miles. The gas gauge seams to not be working correctly as it slowly "makes gas" as I drive. As an example, starting with a full tank I drove 200 miles and it only dropped to 3/4. I stopped at a rest stop for a quick break and when I started the engine back up the needle was below 1/2 tank. After hitting the road, within 10 miles of highway driving the needle had slowly creeped back over 3/4 of a tank. I had a mechanic plug into the system to check the gauges and they check out fine, so I assume I have an issue with a sending unit. My question is about the sending unit (or units). Does the dual tank setup only use the front pump's sending unit to run the gauge or does the system somehow use both the front and rear pump's sending units to operate the gauge? I'd like to do the repair myself to save the money but don't want to take out both tanks if I don't have to. I've found bits and pieces about the system, but it's been nearly impossible to find answers on how this system works in its entirety, including the sending unit portion. Any help will be much appreciated! Thanks, Jamie

Hello all, We just bought a 2004 Yukon XL 2500 to haul our family, and a still to be purchased travel trailer (along with the rest of the world). Its a 31,000 mile 2500 SLT with the 8.1L and 4:10 rear end so it should do the job for us. I'll be poking around here a bit to learn about a few issues it's having and I look forward to interacting with the other members. Cheers! Jamie