nonmechanic

I have an '02 Blazer that has developed a gas tank problem. It will not allow gas to go into the tank.
I suspect a jammed check valve somewhere in the vent system. I have removed every vent line on it and blown air back through them to no avail. There are no kinks anywhere. I topped the tank off one
day and that was all she wrote. I read in the manual, after the fact, that topping off the tank is a no no.
Someone please help me resolve this issue! It's cold standing there for 10 minutes trying to get 2-3
gallons in it.
Thanks,
Bruce (non mechanic)

engine2

Try posting this in the blazer section of this forum to get more answers. I can tell you that something is definately stuck and would not try to force any gas in.