I'm embarrassed to admit that I have run out of gas now three different times. I do okay if I go based on milage, but with the price of fuel going up, I put $30 or $40 buck in, and that kinda throws off my calculation. Anyway, seems that I run out and the gauge still shows about 1/4 of a tank. Where do I start? I'm assuming its the float, but I don't really know what else is back there in the tank. Will I have to replace the whole sending unit or is there a cheaper fix? Thanks.