70 Jimmy, Hill Climbing, and Fuel Pickup

[vancelot69]

I have recently replaced the fuel tank in my 70 Jimmy 4x4 and eventually I want to do some hill climbing in it. However, today I was watching some hill climbing videos and got to wondering, what's to keep the fuel from draining away from the old, non-fuel injected sending unit (or even a fuel injected one for that matter)? While changing my tank, I noticed that the sending unit doesn't have a way to keep gasoline over it for constant pickup. Is there some kind of mod you're supposed to do? Or just run and hope for the best? I don't imagine that "back in the day", or even nowadays, the average off-roader made fuel tank mods to keep that from happening.

Thanks for any info y'all can give me!