full tank works for every kind of fuel delivery, carb injection, straw and hand held pump whatever...
The goal is density, keeping it still. To keep a half tank decent...keep the temps above tank colder. Wagons could have a rubber truck type mat above thier tanks (My fuel increased). Sedans could line thier trunk too, hatchbacks. pickups get liners as well...there is a bizarre strangeness if fuel has zero escape above it, air related or thermal, it reacts noticably. The fuel pump will strain after mentioned tips.
An extreme to this phenomona is the crazy honda vid that was kicking around with a gutted interior. the top of the gas tank ruptured into the car, and that tank wasn't full to cause it. This is the very physic I talk of..its like gas has eyeballs to a way out with a defiance that won't make much sense...unless completely dark and cold..and even think of UV penetration...
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