I find some servo pumps go a bit fast and the fuel comes up the filler neck, but the neck is basically just a pipe that goes straight into the top of the tank, it doesn't have a pinchpoint lower down or anything.
On my 244, once it trips the fuel filler nozzle, I go again at maybe 1/3 flow and the second time it trips I'm done.
It also helps to play around with how you have the nozzle in the filler neck.
Although in saying this, newer 240s have a little flap that you put the nozzle into, so you can't really move it around. Older ones you take the cap off and there's nothing but filler neck behind it.
