DCoop

to Senior Enthusiast. I think your idea will be the easiest and cheapest to start with. It's off to the shop for a complete scan and set up. DCoop..

Thankyou for the info. I have never let the light come on as I'm afraid of burning out the fuel pump. My gas mileage sucks as I am usually pulling my car trailer with my antique truck on it to car shows. When not towing, a 40 mile trip is about 3 gallons. With the 6.2 L engine I don't expect much better, but is great for towing.

To: Senior Enthusiast, Thankyou for the info, I will have to drop the tank, I'd say that i'll let you know, but I just had it grease under coated, so I won't be doing that til next spring. DCoop

My 2010 Yukon Denali seems to have a gas tank problem. I can fill it as fast as I want to so it's not a venting problem. My problem is that when the gauge reads 3/4 tank I can only put in 4 gallons (15 liters) at 1/2 tank it takes 8 gallons (30 liters) and down to a 1/4 tank only takes 12 Gallons (45 Liters) to fill it. I'm afraid to run it any lower due to the possibility of burning out the fuel pump, if it's not covered with gas. Everything I read says it should be a 23 gallon (90 liter) tank. I'm forever stopping to fill it up. I have measured the tank, it is 48" X 17" X 7".. that means it should hold the 23 gallons or 93 liters. BUT IT DOESN"T. The way the gas gauge reads max will be 15 gallons or 60 liters. The gas gauge reading to fill up ratio never varies so I don't think its a faulty gauge. Anyone have suggestions or have dealt with this problem??