Air bubble in fuel tank and vent control for heater doesn't work

The gas tank has a vent valve, if it is not working, as you put fuel into the tank, air is staying trapped inside, and when it reaches high enough pressure it shuts off the gas pump. For the heater you probably have a bad door in your HVAC duct that isn't opening or closing to allow hot air to go through. Being a 95 this is probably vacuum or cable operated, so it shouldn't be hard to see which part isn't pulling its weight.