Chevy cut away chassis putting gas in

Picture the cutaway chassis as delivered to the RV builder. The filler's on a bracket of some kind, pretty much lined up with the inlet to the tank. Does that sound right? Sometimes the builder leaves it about there, and I'd imagine they fill OK. On ours, the filler is moved all the way to the back of the coach, using what looks like conduit as filler and vent piping. I think it was to get away from ignition sources since the fridge and furnace are close to the original filler location. Anyhow, I was replacing the rubber parts of the lines, and decided to "clean up" the way the conduit was hung. The word "Hung" is charitable. Couple ZIP ties off something else and they called it good. When I got the lines straight and level...wouldn't fill... I had to let them go cockeyed again. Fueling nose-down helps, but it fills OK on the level again now. Look up under there and see how the fill and vent lines run. You may be able to make minor changes that make a big difference.

I have a few of the plastic non-vented gas cans. I put a "transmission funnel" in the filler neck and totally remove the cap and spout from the cans. Then pour so the opening is at the top of the liquid. Very little spills...