Fuel Gage...93 loyale

the fuel gage on my 93 loyale 2WD 1.8L is not registering fuel. Is this accessable? I figured it was inside the fuel tank. also it stalled out this morning while driving. The car was running a little rough prior to this. but I just thought it had to do with the intake manifold gaskets. they both are dribbling coolant out. They are on order from sub. my sister claims she put $5 worth of fuel just before the car stalled out, but when her boyfriend delivered a gallon of fuel it started up. Intake manifold gaskets = vacuum leak ...correct? she said it felt like it was running out of fuel but she had just put fuel in. the fuel pressure is fine. I cheaked. anyone have an educated guess?