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Return fuel systems absorb heat from the engine compartment. The longer you drive the hotter the tank gets as the fuel absorbs more and more heat. If you are using a belly pan, you need to provide some means for the air to circulate over the tank for cooling. You also need to make sure the exhaust system heat is not allowed to heat up the tank.
On hot days you can also get heat from the pavement, especially ashphalt, which can get very hot in direct sunlight, probably over 200 degrees if there is little wind.
The fuel tank in return systems is like a radiator. Some airflow is necessary for proper cooling. You will neve see a properly working fuel tank with vapor recovery reach a dangerous pressure point, unless you remove all potential cooling and add other heat sources like the exhaust system. If you had this happen the charcoal cannister would be overwhelmed with fuel vapors and you would smell fuel when you stopped. You would probably also get a check engine light indicating a vapor recovery problem.
regards
Mech
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