Generator issue

There is a inline filter but it between tank and vehicle carb, I replaced it shortly after buying the rv. I'm still trying to figure out where the fuel line to the generator comes from. I've read when the tank gets around 1/4 full the generator will shut off. I was assuming the line was just higher on the tank and wouldn't pick up fuel but as far as I've gotten on the line it looks like it goes to vehicle carb. Hard to track it because it disappears under the firewall and I can't see much under hood. Will probably take dog house off tomorrow and try it that way and will try a hose in a can of gas to see if that will run the generator.